Man do I love Paul Krugman:
Long ago — basically when I started writing for the Times — I decided that I would judge the character of politicians by what they say about policy, not how they come across in person. This led me to conclude that George W. Bush was dishonest and dangerous back when everyone was talking about how charming and reasonable he was. It led me to conclude that Colin Powell couldn’t be trusted, back when everyone said his UN speech clinched the case for war. It led me to conclude that John McCain was unprincipled and self-centered, back when everyone said he was a deeply principled maverick. And yes, it led me to conclude that Barack Obama was a good man, but far less progressive than his enthusiastic supporters imagined.
This seems like truly sage advice; ignore appearances, listen to ideas, and make an informed judgement of character.