We were running against an incumbent president who very openly and aggressively supported legal abortion. (firstthings.com)
25 % think they would vote against the incumbent governor, and 15 % say it depends on who runs against him. (maristpoll.marist.edu)
Given the above, does it ever make sense to vote against the incumbent in his party's primary, by voting for a same - party challenger? (politics.stackexchange.com)