McCain debate

OK, so what was McCain thinking when he went out more or less attacking Obama? What reaction is he looking to get from American voters? Even more, Obama came right back showing that he was able to stand his ground. Yes, McCain is has experience and knowledge, but for his best iterest he shouldnt attack the other candidate in the first debate unless for sure he knew Obama couldnt back himself. So, I think McCain's campaign managers should re-think what he says for the next debate.