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Here's a timeline that I came up with, Have Dean get the Democratic nomination in 2004 and pick John Edwards as his runningmate and defeat Bush. Then Edwards resigns as VP after his sex scandal is exposed and Dean replaces him with Mark Udall. Dean is re-elected in 2008 in a landslide over Charlie Crist. Obama jumps into the 2012 election against Udall and Edwards and pulls off an upset to get the nomination.