Four presidential candidates are lined up to visit Jon Stewart on The Daily Show over the next three weeks as Comedy Central's satirical news review ramps up its "Indecision 2008" coverage. Sen. Joe Biden, the Delaware Democrat, is first up this Wednesday. Biden appeared on The Daily Show last winter on the day he announced his candidacy. Republican John McCain makes his 10th appearance on Aug. 16, followed by another Republican, former Wisconsin Gov. Tommy Thompson, on Aug. 20. On Aug. 22, Democratic contender Barack Obama comes back to the show for a second time, his first as a declared candidate. Chris Dodd, Bill Richardson and John Edwards have been on The Daily Show this political season. Though her husband was on in 2006, Hillary Rodham Clinton has not been on the show. Republican Rudolph Giuliani hasn't been on since 2004.