How many hardcore pro-lifers vote Democrat? As a Catholic, I sometimes meet other members who believe that abortions should not be legal, but who nevertheless vote for Democrats. The most common argument seems to be that they are not one-issue voters. (I imagine that frequently the other issue they have in mind is their wallet).
The General Social Survey asked 1,262 Americans if they thought a woman should be able to get an abortion after being raped. The bottom graph shows that 29% of people who answered no still voted for Kerry. That's a pretty hardcore position on abortion, so I'm surprised to see even that many people vote for a pro-choice candidate.
How does that compare with an abortion-on-demand woman voting for a Republican? The top graph shows voting percentages by answer to the question, "Should a woman be allowed to get an abortion for any reason?" (Sample size is 750.) Thirty-three percent of woman who have this extreme position on abortion voted for Bush anyway. It looks like hardcore pro-life voters are about as willing to set their view aside when voting as strongly pro-abortion women are.