At presidentpolls2008.com, they have information from the latest national polls, made by USA Today, CNN, ABC, among others. They have a history of recent polls so you can see the changes in time, although they tend to stay the same. For the Democrats side, Clinton as a favorite, followed by Obama getting a little closer recently, but not as much. On the Republican side, Giuliani ahead of MC Cain with a stable difference of around 15%. Hope you find this useful. Good Luck!