On Nov. 5, the presidential election winds up in a electoral-college tie, 269-269, the Democrat-controlled House picks Sen. Barack Obama as president, but the Senate, with former Democrat Joe Lieberman voting with Republicans, deadlocks at 50-50, so Vice President Dick Cheney steps in to break the tie to make Republican Sarah Palin his successor.

Sound impossible? It's not. There are at least a half-dozen plausible ways the election can end in a tie, and at least one very plausible possibility - giving each candidate the states in which they now lead in the polls, only New Hampshire - which went Republican in 2000 and Democratic in 2004, each time by just 1.5 percent - needs to swap to the Republican column to wind up with a 269-269 tie.

269 tie: An electoral college 'doomsday'?