Who was appointed the seat left vacant by a former Las Vegas, Nevada politician in the United States Senate Election in Nevada 2012?
Dean Heller
Title: John Ensign
Passage: John Eric Ensign (born March 25, 1958) is an American veterinarian and former politician based in Las Vegas, Nevada.  He was a Congressman and United States Senator from Nevada, serving in the latter seat from January 2001 until May 2011.  He resigned amid a Senate Ethics Committee investigation.
Title: Tom LaBonge
Passage: Thomas J. "Tom" LaBonge (born October 6, 1953) is an American politician.  He was a member of the Los Angeles City Council representing the 4th district, serving from 2001 to 2015.  He won a special election to fill the seat left vacant by the death of long-time council member John Ferraro.  The district represents a wide diversity of incomes and neighborhoods.  At the time he was in office, he was the Chairman of the Arts, Parks, Health and Aging committee, Vice Chairman of the Transportation Committee and the Ad Hoc River Committee, and member of the Trade, Commerce & Tourism Committee, and the Ad Hoc on Recovering Energy, Natural Resources & Economic Benefit from Waste for L.A. (RENEW LA) in the city of Los Angeles.  He is a member of the Democratic Party.
Title: United States Senate election in Nevada, 2012
Passage: 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.
United States Senate election in Nevada, 2012 John Ensign