Washington (CNN) - Just about every blockbuster movie is followed by a sequel, or two. The tea party cross country caravan, it appears, is no different. A Tea Party Express official tells CNN that they're planning a third national tour in late March and early April that will culminate in the nation's capitol on April 15, tax deadline day.Levi Russell, a spokesman for the group, which is organized by the conservative political action committee Our Country Deserves Better, says the slogan for the tour is "just vote them out."Russell says that with the crucial 2010 midterm elections just months away,...