Tonight, Poliwood, a documentary essay about the intersection of politics and celebrity, premieres on Showtime. Tomorrow night, By The People: The Election of Barack Obama, a celebratory look at Obama’s campaign, premieres on HBO. Together, they provide a look at the "buoyant optimism" that swept Obama into the White House, while making you wonder about the effect of TV on the political process. Poliwood follows a group of well-known faces associated with the Creative Coalition, a bipartisan group of celebrities who are shown making an earnest effort to learn more about the issues and to grapple with how to use...