As a critical week in his presidency opens, President Obama is facing a big struggle not just for support on Syria but for the nation's attention, Politico finds. He'll make his case with interviews on six TV news shows today, where he'll be competing with the opening night of Monday Night Football, and with an address to the nation tomorrow, when the competition includes primary elections in New York City and the new iPhone launch. Officials say that Obama, who dined with a dozen GOP senators at Joe Biden's residence last night, will use tomorrow's prime-time address to argue that not punishing Bashar al-Assad for the use of chemical weapons would embolden both the Syrian and the Iranian regimes.