during discussions about Obama's various negotiations with Congress, you often hear "Read the Constitution! The President can't pass laws!" No, but if the President really wants a law passed, they can do things that aren't in the Constitution, for example:
http://abcnews.go.com/blogs/politics/2012/11/president-obama-to-call-for-deal-on-tax-cuts-argue-that-impact-on-economy-for-tax-increases-on-wealthy-will-be-minimal/
White House officials insist that they’re confident that a deal will be struck. One top Obama adviser, however, told ABC News that if the House GOP refuses to cut a deal with the president that includes some tax increases on the wealthy, the tax cuts will expire. One scenario the official discussed included the president barn-storming the country, telling the public that Democrats will put forward a bill to restore middle class tax cuts as soon as Congress convenes, and calling on them to pressure Republican congressional leaders to stop holding those tax cuts hostage in exchange for tax cuts for wealthier Americans.