First of all I'd do anything in my power to stay in office as long as possible, and, shortly after that make Stephen Colbert my secretary of state and Jon Stewart my VP. After those, I'd start publicly disgracing any elected official caught taking bribes or otherwise screwing with the rules for personal gain (Congressman Rangel, looking at you [for those not in the US or didn't hear about it, he was convicted of 11 ethics violations and got re-elected with something like 70% of the vote, and his only punishment was a verbal reprimand]), and cut everything but the necessities from the budget. Take money from the arts (some, at least) and give it to either the colleges to lower their tuition or the sciences for cutting-edge research. Not to mention repeal Obamacare, promote nuclear power, and maybe work on the tax laws some. If I actually got all that accomplished the rest of the problems would probably sort themselves out in time, so I'd probably start trying to screw with the media in some way, just for kicks.