If your pro-life stance is one that you value above all else, then veer away from candidates like Mitt Romney and Newt Gingrich, for they both have shaky stances on the issue (though Romneys has evolved).
Newt Gingrich is rock solid, pro life.
People who tend to be more socially moderate might flock to candidates like Romney, Gingrich, Paul, and Huntsman; putting issues like abortion and gay marriage on the back burner.
Fact check needed on Gingrich.