Stupak.
Etymology: Eponym for Congressman Bart Stupak.
Function: verb
1: In a legislative process, to obstruct passage of a proposed law on the basis of a moral principle (i.e. protecting the unborn), accumulating power in the process, then at a key moment surrendering in exchange for a fig leaf, the size of which varies according to the degree of emasculation of said legislator and/or as a reflection of just how stupid people are presumed to be. (Slang: backstabber.)