Personally, I think flip-flopping is a sign of intelligence and shows a willingness to learn. But since the Republicans think flip-flopping is worse than torturing people or invading countries that don't pose a threat, here are President Bush's top ten flip flops.
President Bush: "We found the weapons of mass destruction. We found biological laboratories."(May 29, 2003)
President Bush: "I recognize we didn't find the stockpiles [of weapons] we all thought were there." (Sept. 9, 2004)