It is dismaying to hear some pro-life politicians calling for a "truce" on social issues like abortion - possible White House contenders Indiana Gov. Mitch Daniels and Mississippi Gov. Haley Barbour among them. Their suggestion is that it's more important to do whatever is necessary to get elected than to worry about issues that appear to be intractable. This tactic is akin to the pro-life and pro-abortion movements agreeing to disagree, an option often considered a reasonable one. It does not require that either side change its views, but simply agrees to allow the different views, and the practices that...