Obama gets Stewart treatment tonight

You've heard, perhaps, of the "Russert Primary," where candidates for office are subjected to a thorough grilling by tenacious NBC newsman Tim Russert on his show, "Meet the Press." Well, Jon Stewart, he of "The Daily Show" on Comedy Central, has developed something of his own gauntlet, and Barack Obama is the latest candidate to walk it. Look for Obama tonight on Stewart's show, which airs at 11 p.m. EST. Several other presidential aspirants have appeared on Stewart's show as part of his "Indecision 2008" segment. John McCain recently made his 10th "Daily Show" appearance, according to Comedy Central.