Question: The 2012 United States Senate election in Nevada ended in a narrow win for which incumbent Republican?

Context articles: United States Senate election in Texas, 2012
United States Senate election in Arizona, 2012
United States Senate election in Nevada, 2012
United States Senate election in Alaska, 2002
United States Senate election in Wyoming, 2012
Dean Heller
United States Senate election in Ohio, 1992
United States Senate election in Delaware, 1972
United States Senate election in Utah, 2012
United States Senate election in Indiana, 2012

The 2012 United States Senate election in Texas was held on November 6, 2012, along with other elections to the United States Senate the United States House of Representatives in additional states.
 Incumbent Republican U.S. Senator Kay Bailey Hutchison decided to retire instead of running for re-election to a fourth full term.
The 2012 United States Senate election in Arizona was held on November 6, 2012, alongside a presidential election, other elections to the United States Senate in other states, as well as elections to the United States House of Representatives and various state and local elections.
 Incumbent Republican U.S. Senator Jon Kyl, the Senate Minority Whip, decided to retire instead of running for re-election to a fourth term.
 Republican U.S. Representative Jeff Flake won the open seat.
The 2012 United States Senate election in Nevada was held on Tuesday, November 6, 2012, alongside 33 other elections to the United States Senate in other states, as well as elections to the United States House of Representatives, and the 2012 United States presidential election.
 The primary election was held June 12, 2012.
 Incumbent Republican U.S. Senator Dean Heller, who was recently appointed to this seat left vacant by resigning U.S. Senator John Ensign, was narrowly elected to his first full term over Congresswoman Shelley Berkley.
The 2002 United States Senate election in Alaska was held on November 5, 2002.
 Incumbent Republican United States Senator Ted Stevens ran for and won a sixth term in the United States Senate.
 He faced perennial candidate Frank Vondersaar, the Democratic nominee, journalist Jim Sykes, the Green Party nominee, and several other independent candidates in his bid for re-election.
 Ultimately, Stevens crushed his opponents to win what would be his last term in the Senate, allowing him to win with the largest margin of victory for any Senate election in Alaska, as well as the highest percentage of the vote in any of his elections.
The 2012 United States Senate election in Wyoming took place on November 6, 2012, alongside a U.S. presidential election as well as other elections to the United States Senate and House of Representatives and various state and local elections.
 Incumbent Republican U.S. Senator John Barrasso won re-election to a first full term.
Dean Arthur Heller (born May 10, 1960) is the senior United States Senator from Nevada and a member of the Republican Party.
 He was elected in Nevada to that state's open U.S. Senate seat in 2012.
The 1992 United States Senate election in Ohio was held on November 3, 1992.
 Incumbent Democratic U.S. Senator John Glenn won re-election to a fourth term, coinciding with Bill Clinton's narrow win during the presidential election.
 Glenn's voting percentage of 51% represented the worst performance of his four runs for the Senate, likely due to the presence of third-party candidate Martha Grevatt of the far-left Workers World Party.
 As of 2016, this is the last time the Democrats have won the Class 3 Senate Seat from Ohio.
The United States Senate election in Delaware, 1972 was held November 7, 1972.
 Incumbent Republican United States Senator J. Caleb Boggs ran for a third term in the United States Senate.
 Boggs faced off against Joe Biden, a New Castle County Councilman.
 Though Senator Boggs was expected to easily win a third term over the then-unknown Biden, it ended up being the closest Senate election in 1972, and Biden narrowly beat out Boggs by a little over three thousand votes, winning what would be his first of seven terms.
The 2012 United States Senate election in Utah took place on November 6, 2012, concurrently with the 2012 U.S. presidential election as well as other elections to the United States Senate and House of Representatives and as various state and local elections.
 Incumbent Republican U.S. Senator Orrin Hatch won re-election to a seventh term against former state Senator and IBM executive, Scott Howell the Democratic candidate.
The 2012 United States Senate election in Indiana took place on November 6, 2012, concurrently with the U.S. presidential election as well as other elections to the United States Senate, House of Representatives, and various state and local elections.
 Incumbent Republican U.S. Senator Richard Lugar ran for re-election to a seventh term, but was defeated in the primary by Tea Party-backed Richard Mourdock.
 Congressman Joe Donnelly, a moderate Democrat from Indiana's 2nd Congressional District, received his party's nomination after running unopposed in the primary contest, and then defeated both Mourdock and Libertarian Andrew Horning in the general election.