On GPS Sunday, Fareed Zakaria and Richard Haass discuss what to make of Obama's decision to send troops to Syria, after years of insisting he would NOT do that. Then, a look inside the administration's thinking on Syria's next door neighbor - Iraq - with Deputy Secretary of State, Antony Blinken. Also, scientist & author Richard Dawkins on why it's a "disgrace" that some GOP candidates say they don't believe in evolution. And, an expert panel weighs in on how to read the presidential polls.