the NY Times has a fun tool that lets you play with the paths to 270. The tool shows that there are 512 paths to victory and lets you build the tree-diagram for the six swing states of Fl, NC, VA, WI, CO, and NH. It starts with 431 ways for Obama to win, 5 ties and 76 ways for Romney to win. Giving a win in Ohio leaves Obama with 244 ways to win, 1 tie and 11 paths for Romney. Starting with a win in Nevada, Obama then has 225 ways, 1 tie and 30 paths for Romney.
Have at to keep yourself entertained until 11PM tomorrow.