"Democrats Carrying Anti-Abortion Banner Put More Congressional Races in Play"

This article in the New York Times yesterday really disturbed me. With only two major parties to choose from; one of whom is currently controlled by the conservative Christian right-wing faction, the other currently pouring money into the races of pro-life candidates in an effort to win congressional seats, what options do the people have who stand on the left end of the spectrum and see right to chose as a cornerstone Democratic principle?