Election year moderate 

A politician, usually an ultraconservative, fascist Republican, but occasionally an ultraliberal, who pretends to take moderate positions on important political issues during an election year. Once elected, this politician will suddenly forget his or her campaign promises and govern from the fringes.

Election year moderates from the far right: Rick Santorum (latin for Asshole); George W. Bush; from the far left: George McGovern (1972)

Election year moderate by Stop the Pendulum August 9, 2006