Play of the Day: Clinton's Travels in Iowa

Wednesday marked the deadline to file taxes and The Late Show's David Letterman's staff brought out an animated 1040 form to let everyone in the audience know of the threat of federal prison for those who fail to file. Conan O'Brien joked about the 74,000-page tax code, mostly because he knows when it gets really good.

Hillary Clinton's travels in Iowa continue to fascinate late-night television hosts. The Daily Show's Jon Stewart joked about the political media's intensity in following Clinton's campaign van, while O'Brien and Letterman reminded everyone how inevitable Clinton thinks she is.

Make sure to check out the new truck-based Rand Paul ad that Letterman's staff cooked up at 2:15.