 He unsuccessfully challenged two-term incumbent Blanche Lincoln for the Democratic nomination for the U.S. Senate, losing in the June 8, 2010 runoff after neither won a majority in the May primary.After the bruising primary, Lincoln lost to her Republican opponent John Boozman in the general election.Halter ran for the Democratic nomination for Governor of Arkansas in 2014 but dropped out, citing concerns over a divisive primary hurting Democratic chances for the seat.