Eyeballing the results, it looks like close to 50% of Manchin voters voted for Romney, which is remarkable.
The Senate usually has at least one weird result like that each election. Baucus (D) got 73% in MT in 2008. Dorgan (D) got 68% in ND in 2004. Jeffords (R) got 66% in VT in 2000. Even in landslide years: Boren (D) got 76% in OK in 1984. Eastland (D) got 58% in MS in 1972, when McGovern only got 20%. Go figure out the American electorate
Added to that list should be sam nunn getting 80% of the vote in 1984 while reagan carried GA with 60%. He won reagan votersby 2-1!