These maps from SurveyUSA are very interesting. Since the general election is still months away, these polls should be taken with a grain of salt. While these numbers may not mean anything by the time the general election comes along in November, they could have a big impact on the Democratic primary. While it is nearly impossible for Hillary Clinton to win the most pledged delegates, she needs a very good argument to convince the superdelegates to overturn the will of the people. Her best, and probably only effective, argument is electability. Polls like this could be a real problem for her campaign.
Barack Obama vs. John McCain
Hillary Clinton vs. John McCain