In a comprehensive look at the shifting politics of late night television, Politico essentially admits what conservatives have long been saying: late night comedians skew left. According to the article, Jay Leno, the notable exception to the rule, leaves a void for Republicans looking to connect with late night's audience:
The curtain rose this week on a new era of late-night TV — altering the terrain for politicians who frequent the shows and complicating life for Republicans, who have lost their most comfortable seat in front of the camera.
“Letterman particularly in recent years has gotten very one-sided, so if conservatives want to complain about late-night media bias, it’s Letterman and not Leno they had to worry about,” Lichter said. “I’m sure conservatives thought of Leno as more balanced, and our data bear that out to some degree.”