Everybody in competitive races. Georgia Rep. John Barrow, Minnesota Rep. Collin Peterson, and West Virginia Rep. Nick Rahall are among the very last Democrats in districts that voted for the Romney-Ryan ticket in 2012. They went "aye." So did Iowa Rep. Bruce Braley and Michigan Rep. Gary Peters, both Senate candidates in tough races. On the Republican side, Senate candidates Tom Cotton and Steve Daines voted "aye," as did Colorado Rep. Mike Coffman and Florida Rep. Steve Southerland. They're the only two Republicans in seats that appear now to be toss-ups, with strong Democratic challengers cutting through the headwind.
To me this supports the idea that the House of Representatives tracks public opinion - at least in certain areas. The general population - and presumably the voters who will go to the polls - supports the war, so if you are in a close race, you know what you need to do.