Following a Sunday night debate, a Republican U.S Senate candidate is left explaining why he failed to vote in the 2010 Senate race.

A spokesperson for U.S. Senate hopeful Dan Sullivan says he abstained from voting in the Senate race because he was concerned his vote would be a conflict of interest with his duties as attorney general, a position he held during the election.

Sen. Lisa Murkowski mounted a general-election write-in campaign after she lost the Republican nomination to Joe Miller, who is also running for U.S. Senate again this year.

Sullivan’s spokesperson said he did vote in 2010, just not in the Senate race.

Lt. Gov. Mead Treadwell, the third candidate vying for the 2014 U.S. Senate Republican nomination, said he did vote and wrote in Murkowski.

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