It puzzles me that many so-called Bible-believing Christians make pro-life issues in an election a marginal factor. They may disagree with the pro-abortion position but tolerate it by insisting that we should not be "single-issue" voters. I encourage you to read what John Piper says in this article on abortion and being a single-issue voter: (The entire article is here)
No endorsement of any single issue qualifies a person to hold public office. Being pro-life does not make a person a good governor, mayor, or president. But there are numerous single issues that disqualify a person from public office. For example, any candidate who endorsed bribery as a form of government efficiency would be disqualified, no matter what his party or platform was. Or a person who endorsed corporate fraud (say under $50 million) would be disqualified no matter what else he endorsed....Here is a helpful link to voter guides that relate to moral issues.
It's the same with marriage. No one quality makes a good wife or husband, but some qualities would make a person unacceptable. For example, back when I was thinking about getting married, not liking cats would not have disqualified a woman as my wife, but not liking people would. Drinking coffee would not, but drinking whiskey would. Kissing dogs wouldn't, but kissing the mailman would. And so on. Being a single-issue fiancé does not mean that only one issue matters. It means that some issues may matter enough to break off the relationship.
So it is with politics. You have to decide what those issues are for you. What do you think disqualifies a person from holding public office? I believe that the endorsement of the right to kill unborn children disqualifies a person from any position of public office. It's simply the same as saying that the endorsement of racism, fraud, or bribery would disqualify him—except that child-killing is more serious than those...
When we bought our dog at the Humane Society, I picked up a brochure on the laws of Minnesota concerning animals. Statute 343.2, subdivision 1 says, "No person shall . . . unjustifiably injure, maim, mutilate or kill any animal." Subdivision 7 says, "No person shall willfully instigate or in any way further any act of cruelty to any animal." The penalty: "A person who fails to comply with any provision of this section is guilty of a misdemeanor."
Now this set me to pondering the rights of the unborn. An eight-week-old human fetus has a beating heart, an EKG, brain waves, thumb-sucking, pain sensitivity, finger-grasping, and genetic humanity, but under our present laws is not a human person with rights under the 14th Amendment, which says that "no state shall deprive any person of life . . . without due process of law." Well, I wondered, if the unborn do not qualify as persons, it seems that they could at least qualify as animals, say a dog, or at least a cat. Could we not at least charge abortion clinics with cruelty to animals under Statute 343.2, subdivision 7? Why is it legal to "maim, mutilate and kill" a pain-sensitive unborn human being but not an animal?
These reflections have confirmed my conviction never to vote for a person who endorses such an evil—even if he could balance the budget tomorrow and end all taxation.