Kevin Williamson has this to say:
Tim Kaine apparently is blissfully unaware of the fact, but it is a long part of the Christian tradition, and especially prominent in the Catholic tradition, that the basic facts of the universe — physical and moral — can be discerned through the light of human reason, independent of religious revelation.
Intellectually, Tim Kaine’s argument about abortion is incoherent and indefensible; it is, in fact, illiterate. He argues that while his own Catholic devotion points him in a pro-life direction, the fact that we are a pluralistic society with a constitutional guarantee of religious freedom precludes him from supporting initiatives that would enshrine certain Catholic preferences in law. That did not stop him from campaigning against capital punishment and from using his gubernatorial powers to that end (the Catholic position on the death penalty is not absolute and, given the history of the church, hardly could be; its prohibition of abortion is absolute) any more than the First Amendment has stopped any cookie-cutter progressive with an Italian or Irish surname from citing the example of Jesus when arguing for this or that social-welfare program. (Never mind, for the moment, that this misconstrues that example.) Back in the ancient days when he was running for president, Barack Obama cited his faith in explaining his opposition to homosexual marriage.