Per the excellent work by the Cook Political Report’s David Wasserman, Obama’s national lead over Romney continues to expand as votes keep on coming in. It’s now Obama 50.9%, Romney 47.4%. That’s a bigger (and more decisive) margin than Bush’s victory over John Kerry in 2004 (which was Bush 50.7% and Kerry 48.2%). What’s more, the president’s lead has grown to close to 3 points in Ohio, 4 points in Virginia and 6 points in Colorado. One doesn’t win Colorado by six points without winning swing voters; there isn’t a big-enough Democratic base to make that argument.