# 2020 United States House of Representatives election in Delaware

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The 2020 United States House of Representatives election in Delaware was held on November 3, 2020, to elect the U.S. representative from Delaware's at-large congressional district. The election coincided with the 2020 U.S. presidential election, as well as other elections to the House of Representatives, elections to the United States Senate and various state and local elections. The Democratic and Republican primaries was held on September 15, 2020.
Incumbent Democratic Congresswoman Lisa Blunt Rochester ran for re-election to a third term. She was re-elected with 64.5% of the vote in 2018.
The Republican nominee was Lee Murphy, a private citizen who worked for most of his life at Amtrak as a conductor and manager. Murphy had also worked as an actor and had appeared in Netflix's House of Cards.

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

* Lisa Blunt Rochester, incumbent U.S. representative

#### Declined

* Scott Walker, Republican nominee for Delaware's at-large congressional district in 2018 (ran for Governor as a Republican)

### Endorsements

Organizations
* Sierra Club

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

* Lee Murphy, actor and candidate for Delaware's at-large congressional district in 2018

#### Eliminated in primary

* Matthew Morris, sales consultant

### Results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Lee Murphy | 39,179 | 73.81% |
| | Republican | Matthew Morris | 13,901 | 26.19% |
| Total votes | Total votes | Total votes | 53,080 | 100.00% |

## Libertarian primary
### Candidates
#### Nominee

* David L. Rogers

## Independent Party of Delaware
### Declared

* Catherine S. Purcell, college student and pro-Trump activist

## General election
### Debate

2020 Delaware U.S. House of Representatives debate :
| No. | Date | Host | Moderator | Link | Democratic | Republican | Libertarian | Independent Party of Delaware |
| Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | | | |
| Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Lisa Blunt Rochester | Lee Murphy | David Rogers | Catherine Purcell |
| 1 | Oct. 14, 2020 | University of Delaware | Ralph Begleiter | | P | P | N | N |

### Predictions

| Source | Ranking | As of |
| The Cook Political Report | Safe D | November 2, 2020 |
| Inside Elections | Safe D | October 28, 2020 |
| Sabato's Crystal Ball | Safe D | November 2, 2020 |
| Politico | Safe D | November 2, 2020 |
| Daily Kos | Safe D | November 2, 2020 |
| RCP | Safe D | November 2, 2020 |

### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Lisa Blunt Rochester (D) | Lee Murphy (R) | Catherine Purcell (DI) | David Rogers (L) | Other/ Undecided |
| University of Delaware | September 21–27, 2020 | 847 (LV) | – | 51% | 29% | 5% | 3% | 13% |

### Results

2020 Delaware's at-large congressional district election :
| Party | Party | Candidate | Votes | % | ±% |
| | Democratic | Lisa Blunt Rochester (incumbent) | 281,382 | 57.63% | −6.63% |
| | Republican | Lee Murphy | 196,392 | 40.22% | +4.78% |
| | Independent Party | Catherine S. Purcell | 6,682 | 1.37% | N/A |
| | Libertarian | David L. Rogers | 3,814 | 0.78% | N/A |
| Total votes | Total votes | Total votes | 488,270 | 100.0% | N/A |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold | Democratic hold |
By county :
| County | Lisa Blunt Rochester Democratic | Lisa Blunt Rochester Democratic | Lee Murphy Republican | Lee Murphy Republican | Catherine Purcell Delaware Independent | Catherine Purcell Delaware Independent | David Rogers Libertarian | David Rogers Libertarian | Margin | Margin | Total votes |
| County | # | % | # | % | # | % | # | % | # | % | Total votes |
| New Castle | 184,337 | 66.31 | 87,581 | 31.50 | 3,831 | 1.38 | 2,255 | 0.81 | 96,796 | 34.82 | 278,004 |
| Kent | 42,984 | 50.79 | 39,586 | 46.78 | 1,284 | 1.52 | 768 | 0.91 | 3,398 | 4.01 | 84,622 |
| Sussex | 54,061 | 43.03 | 69,225 | 55.10 | 1,567 | 1.25 | 791 | 0.63 | −15,164 | −12.07 | 125,644 |
| Totals | 281,382 | 57.63 | 196,392 | 40.22 | 6,682 | 1.37 | 3,814 | 0.78 | 84,990 | 17.41 | 488,270 |