Churchill defended his support for Stalin ym”s during WW2 by saying that if Hitler ym”s had invaded Hell he would have at least made a favorable reference to the Devil in the House of Commons. After WW2 he was a staunch supporter of the Cold War.
In any case, there is no such thing as a wasted vote. It makes a statement, most importantly to Hashem. Otherwise, a Republican in a deep blue state or a Democrat in a deep red state should also stay home.