McCain Confused Again About Spreading The Wealth

McCain had a hard time explaining why a progressive taxation system (which we do have here in the US) is not about spreading the wealth. He said it's a "far cry from taking from one group of Americans and giving to another," as he suggests Obama is proposing. Except that's exactly what a progressive taxation system does. The more money you earn, the more you pay progressively in taxes. So that's the taking part. Then McCain says that part of what taxes do is "to help those who can't help themselves." That's the giving to another part. So please explain again Senator McCain what is so big, bad, and evil about what Obama is proposing to do and how it so radically differs from what we already do. I'm not saying that the progressive taxation system is good or bad, just that McCain is attacking Obama for something we already do, and which McCain himself has acknowledged in the past is the right thing to do.