I mashed this together from a free map found at http://www.eduplace.com/ss/maps/usa.html, and the number of electoral votes for each state. You can watch the presidential election returns and keep track as they come in, or you can start coloring ahead of time as you imagine different scenarios.
The number of electoral college votes for each state is based on population figures from the 2000 census. There are 538 votes total. A majority of 270 is needed to win.