http://www.realclearpolitics.com/articles/2007/03/the_state_of_the_race_the_demo.html
Given that Obama has come close to pulling even with Hillary already, I think there is a very good chance that at some point this year he will pass her, since he has room to expand his base of support, and she is desperately trying to hold on to what she has. If Obama becomes the frontrunner, I think Hillary is finished. While a new face frontrunner would normally get tough critical reviews from the press, the major media is in full swoon mode over Obama.
It is still early, but at the moment, I think the shorter odds should be on Obama rather than Hillary, with Edwards, and Gore filling out the longer odds field.
The time has come! The country is ready for the brother!