# 2018 United States Senate election in Indiana

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The 2018 United States Senate election in Indiana took place on November 6, 2018, along with other elections to the United States Senate and House of Representatives and various state and local elections. Incumbent Democratic Senator Joe Donnelly ran for re-election to a second term, however, he lost in the general election to Republican Mike Braun by a margin of 6%. This was the second consecutive election for this seat in which the incumbent was defeated and/or the seat flipped parties.
This was one of ten Democratic-held Senate seats up for election in a state won by Donald Trump in the 2016 presidential election. In 2017, Politico described the race as "possibly the GOP's best opportunity to seize a Senate seat from Democrats" in the 2018 elections. The primary election was held on May 8, 2018. In October 2018, RealClearPolitics rated the race a toss-up between the Democratic and Republican nominees, with the Libertarian receiving a poll average of 6%.
Instead of running for a second senatorial term in 2024, Braun campaigned successfully to become Governor of Indiana.

## Background

In 2012, Joe Donnelly was elected to the Senate with 50% of the vote to Republican nominee Richard Mourdock's 44%. In the 2016 presidential election, Republican nominee Donald Trump won Indiana with about 56.5% of the vote to Democratic nominee Hillary Clinton's 37.5%.

## Democratic primary
### Candidates
#### Nominee

* Joe Donnelly, incumbent U.S. senator

#### Withdrew

* Martin Del Rio, Iraq War veteran

### Endorsements
#### U.S. executive branch officials

* Joe Biden, 47th vice president of the United States

#### U.S. senators

* Doug Jones, U.S. senator from Alabama

#### Organizations

* End Citizens United

### Results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Joe Donnelly (incumbent) | 284,621 | 100.00% |
| Total votes | Total votes | Total votes | 284,621 | 100.00% |

## Republican primary
### Candidates
#### Nominee

* Mike Braun, businessman and former state representative

#### Eliminated in the primary election

* Luke Messer, U.S. representative
* Todd Rokita, U.S. representative

#### Declined

* Jim Banks, U.S. representative
* Susan Brooks, U.S. representative (endorsed Luke Messer)
* Mike Delph, state senator (endorsed Todd Rokita)
* Jackie Walorski, U.S. representative

#### Withdrawn

* Terry Henderson, businessman (endorsed Mike Braun)
* Andy Horning, Libertarian nominee for the U.S. Senate in 2012 and Libertarian nominee for IN-08 in 2014
* Mark Hurt, attorney and former congressional aide
* Andrew Takami, director of Purdue Polytechnic New Albany (endorsed Luke Messer)

### Endorsements
#### U.S. senators

* Tom Coburn (R-OK)

#### State senators

* Liz Brown

#### State representatives

* Ronald Bacon
* Christopher Judy
* Chris May
* Bob Morris

#### Organizations

* National Organization for Marriage
* Tea Party Patriots

#### Newspapers

* The Journal Gazette

#### U.S. representatives

* Susan Brooks, U.S. representative (R-IN)

#### State-level officials

* Martin Carbaugh, state representative
* Dave Heine, state representative
* Todd Huston, state representative
* David C. Long, state senate president pro tempore
* Wendy McNamara, state representative
* Thomas Wyss, former state senator

#### Former state party chairs

* Tim Berry
* J. Murray Clark
* Gordon Durnil
* Al Hubbard
* Jim Kittle
* Bruce Melchert

#### Local-level officials

* Christine Altman, Hamilton County Commissioner
* James Brainard, Carmel mayor
* Andy Cook, Westfield mayor
* Steve Dillinger, Hamilton County Commissioner
* Scott Fadness, Fishers mayor
* Mark Heirbrandt, Hamilton County Commissioner

#### Individuals

* James Bopp, conservative attorney and constitutional scholar

#### State-level officials

* Mike Delph, state senator
* Alan Morrison, state representative
* Hal Slager, state representative
* Heath VanNatter, state representative

#### Former state party chairs

* Jeff Cardwell
* Rexford C. Early

#### Local-level officials

* Ken Meyer, Decatur mayor
* Monty Snelling, Clark County auditor

#### Individuals

* Russ Willis, chairman of the Madison County Republican Party

#### Newspapers

* The Times of Northwest Indiana

### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Luke Messer | Todd Rokita | Mike Braun | Other | Undecided |
| Strategic National (R) | May 5–6, 2018 | 300 | ± 5.7% | 29% | 28% | 44% | – | – |
| Gravis Marketing | April 6–11, 2018 | 280 | ± 5.9% | 13% | 16% | 26% | – | 45% |
| GS Strategy Group (R-Rokita) | January 6–9, 2018 | 500 | ± 4.4% | 9% | 24% | 9% | – | 58% |
| GS Strategy Group (R-Rokita) | July 16–18, 2017 | 500 | ± 4.4% | 20% | 28% | – | – | 51% |
| GS Strategy Group (R-Rokita) | July 16–18, 2017 | 500 | ± 4.4% | 14% | 21% | 11% | – | 55% |
| OnMedia (R-Messer) | July 10–12, 2017 | 400 | ± 4.8% | 23% | 23% | 2% | 7% | 45% |

### Results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Mike Braun | 208,602 | 41.17% |
| | Republican | Todd Rokita | 151,967 | 29.99% |
| | Republican | Luke Messer | 146,131 | 28.84% |
| Total votes | Total votes | Total votes | 506,700 | 100.00% |

## Independent
### Candidates
#### Declared

* James Johnson Jr.

## General election
### Candidates

* Mike Braun, businessman and former state representative (R)
* Lucy Brenton (L)
* Joe Donnelly, incumbent (D)
* James Johnson Jr. (I)

### Debates

* Complete video of debate, October 8, 2018

### Predictions

| Source | Ranking | As of |
| The Cook Political Report | Tossup | October 26, 2018 |
| Inside Elections | Tossup | November 1, 2018 |
| Sabato's Crystal Ball | Lean R (flip) | November 5, 2018 |
| CNN | Tossup | November 5, 2018 |
| RealClearPolitics | Tossup | November 5, 2018 |
| Daily Kos | Tossup | November 5, 2018 |
| Fox News | Tossup | November 5, 2018 |
| FiveThirtyEight | Lean D | November 5, 2018 |

### Fundraising

Campaign finance reports as of October 17, 2018 :
| Candidate (party) | Total receipts | Total disbursements | Cash on hand |
| Joe Donnelly (D) | $16,100,528 | $13,872,981 | $2,321,981 |
| Mike Braun (R) | $16,964,706 | $15,576,842 | $1,387,861 |
| Source: Federal Election Commission ||||

### Endorsements
#### U.S. executive branch officials

* George W. Bush, 43rd president of the United States
* Mike Pence, 48th vice president of the United States
* Donald Trump, 45th president of the United States

#### U.S. senators

* Tom Coburn (R-OK, former)
* Joni Ernst (R-IA)
* Lindsey Graham (R-SC)
* David Perdue (R-GA)
* Todd Young (R-IN)

#### U.S. representatives

* Jim Banks, U.S. representative (R-IN)
* Mark Meadows, U.S. representative (R-NC)
* Todd Rokita, U.S. representative, 2018 Senate candidate (R-IN)

#### Governors

* Eric Holcomb, governor of Indiana

#### State senators

* Liz Brown

#### State representatives

* Ronald Bacon
* Christopher Judy
* Chris May
* Bob Morris

#### Cabinet-level officials

* Kellyanne Conway, Counselor to the President
* Sarah Huckabee Sanders, White House Press Secretary
* Ivanka Trump, Advisor to the President

#### Individuals

* Dan Bongino, NRATV contributor
* Rudy Giuliani, former mayor of New York City
* Kimberly Guilfoyle, television news personality
* Lou Holtz, former Notre Dame football coach
* Bob Knight, former Indiana University basketball coach
* Ronna McDaniel, chair of the RNC
* Oliver North, president of the National Rifle Association of America
* Greg Pence, brother of Mike Pence
* Donald Trump Jr., businessman and son of U.S. President Donald Trump

#### Organizations

* FreedomWorks
* Indiana Manufacturers Association
* Indiana Right to Life
* National Federation of Independent Business
* National Organization for Marriage
* NRA Political Victory Fund
* Republican Jewish Coalition
* Tea Party Patriots
* U.S. Chamber of Commerce

#### U.S. executive branch officials

* Joe Biden, 47th vice president of the United States
* Chuck Hagel, former United States Secretary of Defense (Republican)
* Barack Obama, 44th president of the United States

#### U.S. senators

* Michael Bennet, U.S. senator from Colorado
* Cory Booker, U.S. senator from New Jersey
* Chris Coons, U.S. senator from Delaware
* Catherine Cortez Masto, U.S. senator from Nevada
* Tammy Duckworth, U.S. senator from Illinois
* Dick Durbin, U.S. senator from Illinois
* Kamala Harris, U.S. senator from California
* Doug Jones, U.S. senator from Alabama
* Amy Klobuchar, U.S. senator from Minnesota
* Brian Schatz, U.S. senator from Hawaii

#### Local officials

* John R. Gregg, former Speaker of the Indiana House of Representatives
* Thomas McDermott Jr., mayor of Hammond, Indiana

#### Individuals

* Derrick Mayes, professional football player
* Victor Oladipo, professional basketball player for the Indiana Pacers
* Amy Schumer, actress
* Amy Siskind, activist and writer

#### Organizations

* Alliance for Retired Americans
* Communications Workers of America
* End Citizens United
* National Committee to Preserve Social Security and Medicare
* National Education Association
* United Automobile Workers

#### Newspapers

* Journal Gazette

#### Organizations

* Indiana Chamber of Commerce

#### Newspapers

* Indianapolis Star

### Polling

Graphical summary
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Donnelly (D) | Mike Braun (R) | Lucy Brenton (L) | Other | Undecided |
| HarrisX | November 3–5, 2018 | 600 | ± 4.0% | 42% | 43% | – | – | – |
| HarrisX | November 2–4, 2018 | 600 | ± 4.0% | 43% | 41% | – | – | – |
| HarrisX | November 1–3, 2018 | 600 | ± 4.0% | 43% | 42% | – | – | – |
| HarrisX | October 31 – November 2, 2018 | 600 | ± 4.0% | 44% | 42% | – | – | – |
| HarrisX | October 30 – November 1, 2018 | 600 | ± 4.0% | 43% | 43% | – | – | – |
| HarrisX | October 29–31, 2018 | 600 | ± 4.0% | 40% | 43% | – | – | – |
| Fox News | October 27–30, 2018 | 722 LV | ± 3.5% | 45% | 38% | 5% | 2% | 9% |
| Fox News | October 27–30, 2018 | 852 RV | ± 3.0% | 42% | 38% | 6% | 2% | 11% |
| HarrisX | October 24–30, 2018 | 1,400 | ± 2.6% | 42% | 42% | – | – | – |
| NBC News/Marist | October 24–28, 2018 | 496 LV | ± 5.5% | 45% | 42% | 7% | <1% | 5% |
| NBC News/Marist | October 24–28, 2018 | 496 LV | ± 5.5% | 48% | 46% | – | 2% | 5% |
| NBC News/Marist | October 24–28, 2018 | 800 RV | ± 4.2% | 43% | 40% | 9% | <1% | 7% |
| NBC News/Marist | October 24–28, 2018 | 800 RV | ± 4.2% | 47% | 45% | – | 2% | 7% |
| Cygnal (R) | October 26–27, 2018 | 505 | ± 4.4% | 46% | 49% | – | 3% | 2% |
| YouGov | October 23–26, 2018 | 975 | ± 3.7% | 43% | 46% | 3% | 0% | 8% |
| Mason Strategies (R) | October 15–20, 2018 | 600 | ± 3.9% | 43% | 47% | 3% | – | 7% |
| American Viewpoint (R-Braun) | October 14–17, 2018 | 800 | – | 40% | 44% | 7% | – | 5% |
| SurveyUSA | October 12–16, 2018 | 816 | ± 4.6% | 41% | 40% | 8% | – | 11% |
| Gravis Marketing | October 12–16, 2018 | 377 | ± 5.1% | 44% | 40% | 7% | – | 10% |
| Vox Populi Polling | October 13–15, 2018 | 783 | ± 3.5% | 55% | 45% | – | – | – |
| American Viewpoint (R-Braun) | October 7–10, 2018 | 800 | – | 40% | 44% | 7% | – | 7% |
| American Viewpoint (R-Braun) | September 30 – October 3, 2018 | 800 | – | 39% | 43% | 7% | – | 5% |
| Fox News | September 29 – October 2, 2018 | 695 LV | ± 3.5% | 43% | 41% | 6% | 2% | 9% |
| Fox News | September 29 – October 2, 2018 | 806 RV | ± 3.5% | 41% | 40% | 6% | 1% | 10% |
| Ipsos | September 12–20, 2018 | 1,181 | ± 3.0% | 46% | 43% | – | 3% | 8% |
| Fox News | September 8–11, 2018 | 677 LV | ± 3.5% | 43% | 45% | 3% | 1% | 8% |
| Fox News | September 8–11, 2018 | 804 RV | ± 3.5% | 42% | 41% | 4% | 1% | 10% |
| NBC News/Marist | August 26–29, 2018 | 576 LV | ± 5.0% | 44% | 41% | 8% | 1% | 6% |
| NBC News/Marist | August 26–29, 2018 | 576 LV | ± 5.0% | 49% | 43% | – | 2% | 7% |
| NBC News/Marist | August 26–29, 2018 | 816 RV | ± 4.2% | 43% | 40% | 8% | 1% | 8% |
| NBC News/Marist | August 26–29, 2018 | 816 RV | ± 4.2% | 48% | 42% | – | 2% | 9% |
| Trafalgar Group (R) | July 31 – August 7, 2018 | 1,420 | ± 2.6% | 51% | 39% | – | – | 11% |
| SurveyMonkey/Axios | June 11 – July 2, 2018 | 952 | ± 5.0% | 47% | 49% | – | – | 4% |
| Gravis Marketing | May 10–15, 2018 | 400 | ± 4.9% | 46% | 47% | – | – | 7% |
with Todd Rokita
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Donnelly (D) | Todd Rokita (R) | Undecided |
| Gravis Marketing | April 6–11, 2018 | 411 | ± 4.8% | 50% | 32% | 18% |
with Luke Messer
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Donnelly (D) | Luke Messer (R) | Undecided |
| Gravis Marketing | April 6–11, 2018 | 411 | ± 4.8% | 46% | 36% | 18% |
with generic Republican
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Donnelly (D) | Generic Republican | Undecided |
| SurveyMonkey/Axios | February 12 – March 5, 2018 | 1,809 | ± 3.8% | 45% | 51% | 4% |

### Results

On November 6, 2018, Braun won the general election. He swept southern Indiana, the exurbs of Indianapolis, and most other rural areas in the state. Donnelly ran well behind his 2012 vote totals, winning only in Indianapolis, the university centers (Bloomington, Terre Haute, West Lafayette, South Bend), and the suburbs of Chicago in Northwest Indiana.
United States Senate election in Indiana, 2018 :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Mike Braun | 1,158,000 | 50.73% | +6.5% |
| | Democratic | Joe Donnelly (incumbent) | 1,023,553 | 44.84% | −5.2% |
| | Libertarian | Lucy Brenton | 100,942 | 4.42% | −1.3% |
| | Write-in | Write-in | 70 | <0.00% | N/A |
| Total votes | Total votes | Total votes | 2,282,565 | 100.00% | N/A |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

#### By county

Source
| | Mike Braun Republican | Mike Braun Republican | Joe Donnelly Democratic | Joe Donnelly Democratic | Lucy Brenton Libertarian | Lucy Brenton Libertarian | Margin | Margin | Total |
| County | Votes | % | Votes | % | Votes | % | Votes | % | Votes |
| Adams | 7,511 | 67.39% | 3,146 | 28.23% | 489 | 4.39% | 4,365 | 39.16% | 11,146 |
| Allen | 65,927 | 52.36% | 55,903 | 44.40% | 4,080 | 3.24% | 10,024 | 7.96% | 125,910 |
| Bartholomew | 15,222 | 57.41% | 10,071 | 37.98% | 1,223 | 4.61% | 5,151 | 19.43% | 26,516 |
| Benton | 1,926 | 64.98% | 847 | 28.58% | 191 | 6.44% | 1,079 | 36.40% | 2,964 |
| Blackford | 2,303 | 59.39% | 1,275 | 32.88% | 300 | 7.74% | 1,028 | 26.51% | 3,878 |
| Boone | 15,540 | 56.43% | 10,981 | 39.87% | 1,019 | 3.70% | 4,559 | 16.55% | 27,540 |
| Brown | 4,103 | 57.07% | 2,768 | 38.50% | 318 | 4.42% | 1,335 | 18.57% | 7,189 |
| Carroll | 4,518 | 65.35% | 2,071 | 29.95% | 325 | 4.70% | 2,447 | 35.39% | 6,914 |
| Cass | 6,617 | 57.79% | 4,061 | 35.47% | 772 | 6.74% | 2,556 | 22.32% | 11,450 |
| Clark | 22,766 | 52.60% | 18,551 | 42.86% | 1,967 | 4.54% | 4,215 | 9.74% | 43,284 |
| Clay | 6,207 | 66.91% | 2,601 | 28.04% | 469 | 5.06% | 3,606 | 38.87% | 9,277 |
| Clinton | 5,967 | 64.81% | 2,755 | 29.92% | 485 | 5.27% | 3,212 | 34.89% | 9,207 |
| Crawford | 2,252 | 56.83% | 1,504 | 37.95% | 207 | 5.22% | 748 | 18.87% | 3,963 |
| Daviess | 6,555 | 75.01% | 1,901 | 21.75% | 283 | 3.24% | 4,654 | 53.26% | 8,739 |
| Dearborn | 13,287 | 72.79% | 4,481 | 24.55% | 487 | 2.67% | 8,806 | 48.24% | 18,255 |
| Decatur | 6,246 | 69.35% | 2,287 | 25.39% | 473 | 5.25% | 3,959 | 43.96% | 9,006 |
| DeKalb | 9,167 | 65.80% | 4,204 | 30.18% | 561 | 4.03% | 4,963 | 35.62% | 13,932 |
| Delaware | 17,447 | 46.27% | 18,159 | 48.16% | 2,099 | 5.57% | -712 | -1.89% | 37,705 |
| Dubois | 11,204 | 65.42% | 5,264 | 30.74% | 658 | 3.84% | 5,940 | 34.68% | 17,126 |
| Elkhart | 31,164 | 57.83% | 21,062 | 39.09% | 1,661 | 3.08% | 10,102 | 18.75% | 53,887 |
| Fayette | 4,704 | 63.02% | 2,295 | 30.75% | 465 | 6.23% | 2,409 | 32.27% | 7,464 |
| Floyd | 16,588 | 52.12% | 14,070 | 44.21% | 1,167 | 3.67% | 2,518 | 7.91% | 31,825 |
| Fountain | 4,060 | 69.18% | 1,496 | 25.49% | 313 | 5.33% | 2,564 | 43.69% | 5,869 |
| Franklin | 5,614 | 75.54% | 1,619 | 21.78% | 199 | 2.68% | 3,995 | 53.75% | 7,432 |
| Fulton | 4,154 | 59.28% | 2,539 | 36.23% | 315 | 4.49% | 1,615 | 23.05% | 7,008 |
| Gibson | 8,040 | 64.26% | 4,001 | 31.98% | 471 | 3.76% | 4,039 | 32.28% | 12,512 |
| Grant | 12,393 | 61.76% | 6,745 | 33.61% | 929 | 4.63% | 5,648 | 28.15% | 20,067 |
| Greene | 6,949 | 64.50% | 3,313 | 30.75% | 511 | 4.74% | 3,636 | 33.75% | 10,773 |
| Hamilton | 72,325 | 52.38% | 61,337 | 44.42% | 4,410 | 3.19% | 10,988 | 7.96% | 138,072 |
| Hancock | 19,097 | 63.10% | 9,770 | 32.28% | 1,399 | 4.62% | 9,327 | 30.82% | 30,266 |
| Harrison | 9,847 | 63.05% | 5,131 | 32.86% | 639 | 4.09% | 4,716 | 30.20% | 15,617 |
| Hendricks | 36,966 | 58.85% | 23,599 | 37.57% | 2,247 | 3.58% | 13,367 | 21.28% | 62,812 |
| Henry | 9,569 | 60.98% | 5,171 | 32.95% | 953 | 6.07% | 4,398 | 28.03% | 15,693 |
| Howard | 16,736 | 57.18% | 11,159 | 38.12% | 1,376 | 4.70% | 5,577 | 19.05% | 29,271 |
| Huntington | 8,879 | 67.22% | 3,699 | 28.00% | 631 | 4.78% | 5,180 | 39.22% | 13,209 |
| Jackson | 9,431 | 65.43% | 4,198 | 29.12% | 785 | 5.45% | 5,233 | 36.30% | 14,414 |
| Jasper | 6,987 | 66.00% | 3,278 | 30.97% | 321 | 3.03% | 3,709 | 35.04% | 10,586 |
| Jay | 3,990 | 63.42% | 1,933 | 30.73% | 368 | 5.85% | 2,057 | 32.70% | 6,291 |
| Jefferson | 6,345 | 56.44% | 4,313 | 38.37% | 584 | 5.19% | 2,032 | 18.08% | 11,242 |
| Jennings | 5,921 | 64.72% | 2,686 | 29.36% | 542 | 5.92% | 3,235 | 35.36% | 9,149 |
| Johnson | 32,540 | 62.70% | 17,479 | 33.68% | 1,883 | 3.63% | 15,061 | 29.02% | 51,902 |
| Knox | 7,876 | 62.38% | 3,977 | 31.50% | 772 | 6.11% | 3,899 | 30.88% | 12,625 |
| Kosciusko | 18,558 | 70.34% | 6,801 | 25.78% | 1,022 | 3.87% | 11,757 | 44.57% | 26,381 |
| LaGrange | 5,183 | 67.49% | 2,217 | 28.87% | 280 | 3.65% | 2,966 | 38.62% | 7,680 |
| Lake | 54,564 | 33.62% | 104,390 | 64.32% | 3,340 | 2.06% | -49,826 | -30.70% | 162,294 |
| LaPorte | 16,008 | 42.98% | 20,014 | 53.73% | 1,225 | 3.29% | -4,006 | -10.76% | 37,247 |
| Lawrence | 10,274 | 66.30% | 4,434 | 28.61% | 788 | 5.09% | 5,840 | 37.69% | 15,496 |
| Madison | 22,841 | 51.83% | 18,701 | 42.44% | 2,526 | 5.73% | 4,140 | 9.39% | 44,068 |
| Marion | 98,385 | 32.04% | 197,880 | 64.43% | 10,840 | 3.53% | -99,495 | -32.40% | 307,105 |
| Marshall | 8,747 | 58.71% | 5,619 | 37.71% | 533 | 3.58% | 3,128 | 20.99% | 14,899 |
| Martin | 2,997 | 69.31% | 1,127 | 26.06% | 200 | 4.63% | 1,870 | 43.25% | 4,324 |
| Miami | 6,975 | 67.30% | 2,862 | 27.61% | 527 | 5.08% | 4,113 | 39.69% | 10,364 |
| Monroe | 15,540 | 29.94% | 34,193 | 65.87% | 2,174 | 4.19% | -18,653 | -35.94% | 51,907 |
| Montgomery | 8,362 | 66.69% | 3,518 | 28.06% | 659 | 5.26% | 4,844 | 38.63% | 12,539 |
| Morgan | 17,539 | 69.72% | 6,471 | 25.72% | 1,148 | 4.56% | 11,068 | 43.99% | 25,158 |
| Newton | 2,966 | 65.00% | 1,402 | 30.73% | 195 | 4.27% | 1,564 | 34.28% | 4,563 |
| Noble | 8,993 | 65.70% | 4,132 | 30.18% | 564 | 4.12% | 4,861 | 35.51% | 13,689 |
| Ohio | 1,586 | 66.22% | 747 | 31.19% | 62 | 2.59% | 839 | 35.03% | 2,395 |
| Orange | 4,353 | 64.28% | 2,135 | 31.53% | 284 | 4.19% | 2,218 | 32.75% | 6,772 |
| Owen | 4,601 | 63.96% | 2,210 | 30.72% | 383 | 5.32% | 2,391 | 33.24% | 7,194 |
| Parke | 3,532 | 66.12% | 1,499 | 28.06% | 311 | 5.82% | 2,033 | 38.06% | 5,342 |
| Perry | 3,450 | 48.25% | 3,364 | 47.04% | 337 | 4.71% | 86 | 1.20% | 7,151 |
| Pike | 3,235 | 62.71% | 1,679 | 32.55% | 245 | 4.75% | 1,556 | 30.16% | 5,159 |
| Porter | 29,368 | 45.32% | 33,390 | 51.53% | 2,037 | 3.14% | -4,022 | -6.21% | 64,795 |
| Posey | 6,324 | 59.44% | 3,881 | 36.48% | 435 | 4.09% | 2,443 | 22.96% | 10,640 |
| Pulaski | 2,583 | 59.26% | 1,617 | 37.10% | 159 | 3.65% | 966 | 22.16% | 4,359 |
| Putnam | 7,814 | 65.67% | 3,512 | 29.52% | 573 | 4.82% | 4,302 | 36.15% | 11,899 |
| Randolph | 5,138 | 63.35% | 2,467 | 30.42% | 505 | 6.23% | 2,671 | 32.93% | 8,110 |
| Ripley | 6,880 | 72.66% | 2,350 | 24.82% | 239 | 2.52% | 4,530 | 47.84% | 9,469 |
| Rush | 3,991 | 65.61% | 1,690 | 27.78% | 402 | 6.61% | 2,301 | 37.83% | 6,083 |
| St. Joseph | 36,456 | 39.08% | 53,758 | 57.63% | 3,073 | 3.29% | -17,302 | -18.55% | 93,287 |
| Scott | 4,241 | 55.34% | 3,113 | 40.62% | 309 | 4.03% | 1,128 | 14.72% | 7,663 |
| Shelby | 9,340 | 64.78% | 4,333 | 30.05% | 745 | 5.17% | 5,007 | 34.73% | 14,418 |
| Spencer | 5,202 | 58.61% | 3,218 | 36.26% | 455 | 5.13% | 1,984 | 22.35% | 8,875 |
| Starke | 4,149 | 54.71% | 3,119 | 41.13% | 316 | 4.17% | 1,030 | 13.58% | 7,584 |
| Steuben | 7,839 | 64.39% | 3,864 | 31.74% | 472 | 3.88% | 3,975 | 32.65% | 12,175 |
| Sullivan | 4,340 | 58.66% | 2,663 | 36.00% | 395 | 5.34% | 1,677 | 22.67% | 7,398 |
| Switzerland | 1,874 | 64.07% | 936 | 32.00% | 115 | 3.93% | 938 | 32.07% | 2,925 |
| Tippecanoe | 22,649 | 44.02% | 26,376 | 51.26% | 2,431 | 4.72% | -3,727 | -7.24% | 51,456 |
| Tipton | 4,062 | 66.30% | 1,734 | 28.30% | 331 | 5.40% | 2,328 | 38.00% | 6,127 |
| Union | 1,749 | 69.85% | 682 | 27.24% | 73 | 2.92% | 1,067 | 42.61% | 2,504 |
| Vanderburgh | 29,375 | 50.20% | 27,183 | 46.45% | 1,962 | 3.35% | 2,192 | 3.75% | 58,520 |
| Vermillion | 3,002 | 53.68% | 2,198 | 39.31% | 392 | 7.01% | 804 | 14.38% | 5,592 |
| Vigo | 14,813 | 46.79% | 15,171 | 47.92% | 1,674 | 5.29% | -358 | -1.13% | 31,658 |
| Wabash | 7,658 | 67.78% | 3,159 | 27.96% | 482 | 4.27% | 4,499 | 39.82% | 11,299 |
| Warren | 2,208 | 67.34% | 914 | 27.87% | 157 | 4.79% | 1,294 | 39.46% | 3,279 |
| Warrick | 14,010 | 57.50% | 9,594 | 39.37% | 762 | 3.13% | 4,416 | 18.12% | 24,366 |
| Washington | 6,127 | 65.31% | 2,806 | 29.91% | 448 | 4.78% | 3,321 | 35.40% | 9,381 |
| Wayne | 11,241 | 56.88% | 7,482 | 37.86% | 1,039 | 5.26% | 3,759 | 19.02% | 19,762 |
| Wells | 7,819 | 71.79% | 2,694 | 24.73% | 379 | 3.48% | 5,125 | 47.05% | 10,892 |
| White | 5,100 | 60.05% | 2,739 | 32.25% | 654 | 7.70% | 2,361 | 27.80% | 8,493 |
| Whitley | 9,019 | 67.39% | 3,818 | 28.53% | 547 | 4.09% | 5,201 | 38.86% | 13,384 |

##### Counties that flipped from Democratic to Republican

* Madison (largest city: Anderson)
* Spencer (largest city: Santa Claus)
* Starke (largest city: Knox)
* Vanderburgh (largest city: Evansville)
* Scott (largest city: Scottsburg)
* Blackford (largest city: Hartford City)
* Clark (largest city: Jeffersonville)
* Crawford (largest city: Marengo)
* Floyd (largest city: New Albany)
* Jefferson (largest city: Madison)
* Fayette (largest city: Connersville)
* Henry (largest city: New Castle)
* Howard (largest city: Kokomo)
* Wayne (largest city: Richmond)
* Vermillion (largest city: Clinton)
* Perry (largest city: Tell City)
* Sullivan (largest city: Sullivan)

#### By congressional district

Braun won six of nine congressional districts, with Donnelly winning the other three, including one held by a Republican.
| District | Braun | Donnelly | Elected representative |
| 1st | 37.9% | 60.6% | Pete Visclosky |
| 2nd | 51.0% | 45.5% | Jackie Walorski |
| 3rd | 59.6% | 36.7% | Jim Banks |
| 4th | 57.9% | 37.4% | Jim Baird |
| 5th | 47.9% | 48.4% | Susan Brooks |
| 6th | 60.8% | 34.3% | Greg Pence |
| 7th | 31.8% | 64.5% | André Carson |
| 8th | 57.3% | 38.4% | Larry Bucshon |
| 9th | 54.3% | 41.5% | Trey Hollingsworth |

#### Voter demographics

Edison Research exit poll :
| Demographic subgroup | Donnelly | Braun | No Answer | % of voters |
| Gender |||||
| Men | 40 | 57 | 3 | 49 |
| Women | 49 | 46 | 5 | 51 |
| Age |||||
| 18–29 years old | 48 | 45 | 7 | 13 |
| 30–44 years old | 49 | 43 | 8 | 20 |
| 45–64 years old | 44 | 54 | 3 | 39 |
| 65 and older | 41 | 57 | 1 | 28 |
| Race |||||
| White | 40 | 56 | 4 | 86 |
| Black | 88 | 11 | 1 | 8 |
| Latino | 71 | 22 | 6 | 3 |
| Asian | N/A | N/A | N/A | 1 |
| Other | N/A | N/A | N/A | 2 |
| Race by gender |||||
| White men | 35 | 62 | 3 | 42 |
| White women | 44 | 51 | 5 | 44 |
| Black men | 82 | 15 | 2 | 4 |
| Black women | 95 | 5 | 0 | 4 |
| Latino men | N/A | N/A | N/A | 1 |
| Latina women | N/A | N/A | N/A | 2 |
| Others | N/A | N/A | N/A | 2 |
| Education |||||
| High school or less | 40 | 56 | 4 | 23 |
| Some college education | 40 | 54 | 6 | 26 |
| Associate degree | 41 | 55 | 4 | 13 |
| Bachelor's degree | 46 | 51 | 3 | 22 |
| Advanced degree | 61 | 36 | 2 | 16 |
| Education and race |||||
| White college graduates | 49 | 48 | 3 | 34 |
| White no college degree | 33 | 62 | 5 | 53 |
| Non-white college graduates | 80 | 19 | 2 | 4 |
| Non-white no college degree | 76 | 20 | 4 | 10 |
| Whites by education and gender |||||
| White women with college degrees | 57 | 39 | 4 | 17 |
| White women without college degrees | 36 | 59 | 6 | 27 |
| White men with college degrees | 41 | 57 | 2 | 17 |
| White men without college degrees | 31 | 65 | 4 | 26 |
| Non-whites | 77 | 20 | 3 | 14 |
| Income |||||
| Under $30,000 | 49 | 44 | 8 | 15 |
| $30,000–49,999 | 46 | 49 | 4 | 23 |
| $50,000–99,999 | 44 | 55 | 2 | 35 |
| $100,000–199,999 | 44 | 52 | 4 | 22 |
| Over $200,000 | N/A | N/A | N/A | 5 |
| Party ID |||||
| Democrats | 92 | 6 | 2 | 29 |
| Republicans | 8 | 90 | 2 | 39 |
| Independents | 47 | 44 | 9 | 31 |
| Party by gender |||||
| Democratic men | 92 | 6 | 2 | 12 |
| Democratic women | 93 | 5 | 2 | 18 |
| Republican men | 8 | 91 | 1 | 19 |
| Republican women | 8 | 90 | 2 | 20 |
| Independent men | 42 | 52 | 7 | 18 |
| Independent women | 55 | 33 | 12 | 13 |
| Ideology |||||
| Liberals | 86 | 8 | 6 | 20 |
| Moderates | 59 | 37 | 5 | 40 |
| Conservatives | 10 | 88 | 2 | 40 |
| Marital status |||||
| Married | 43 | 54 | 3 | 61 |
| Unmarried | 51 | 46 | 3 | 39 |
| Gender by marital status |||||
| Married men | 38 | 60 | 2 | 31 |
| Married women | 48 | 49 | 3 | 30 |
| Unmarried men | 42 | 53 | 5 | 19 |
| Unmarried women | 61 | 39 | 1 | 20 |
| First-time midterm election voter |||||
| Yes | 41 | 53 | 6 | 15 |
| No | 46 | 51 | 3 | 85 |
| Most important issue facing the country |||||
| Health care | 70 | 26 | 4 | 41 |
| Immigration | 10 | 85 | 5 | 27 |
| Economy | 31 | 66 | 3 | 21 |
| Gun policy | 66 | 31 | 3 | 8 |
| Area type |||||
| Urban | 63 | 33 | 4 | 31 |
| Suburban | 44 | 53 | 3 | 44 |
| Rural | 37 | 58 | 5 | 25 |
| Source: CNN |||||