Ohio Republican Senator Rob Portman changed his mind about gay marriage once his son came to him to announce that he was gay and had been as long as he could remember. It seems to me illustrative of the GOP's general lack of imagination when it comes to policy. Aid for the poor and homeless? Can't imagine this ever happening to me, says the GOP, so let's not worry about it. Aid for AIDS victims? Can't imagine this ever happening to me, says the GOP, so let's no worry about it. Same-sex marriage? Can't imagine ever wanting to marry someone of the same sex, so let's not worry about that.
In my opinion, good policy is a product of a good imagination. Ultimately, being able to imagine that the situation in which others find themselves is one that you could find yourself.