Every election cycle, the New York Times and similar publications run op-eds or features discussing the ’emerging trend’ (always emerging, never quite emerged) of pro-lifers reconciling themselves to voting for the Democratic party. These articles vary widely in quality, and range from intelligent and provocative (if flawed) to embarrassing, but the most common feature is disenchantment with the current state of the Republican party. I will grant that the case has been easier to make this year given the widespread dissatisfaction with the Republican party (particularly among the chattering classes).
Nevertheless, I think the answer to the title of this post is that, yes, pro-lifers are stuck with, or at least would be best served by, support for the Republican party. Some points for consideration: