Last night, Republican Scott Brown was triumphant after his upset election to the US Senate seat held by the late Democrat Ted Kennedy for 47 years, humiliating the Democrats just one year after Barack Obama's inauguration. But the Massachusetts Republican has not attacked the President himself, and today Brown promised bipartisanship when he gets to Washington. What does his victory mean for healthcare reform and the rest of the presidential agenda? And what are the lessons for Democrats nationwide? We look at the aftermath of an upset that has transformed the political environment in an election year.