As a general point, I probably won't spend a lot of time looking at who's ahead in individual national polls until the Fall. Until the conventions finish and people lock in their understandings of the candidates, the national numbers mean fairly little. But the aggregate polling is showing something interesting right now. From Pollster.com:
It's not Obama's bounce that's interesting. You'd expect that after he won the primary. Its McCain's dip. In other words, Obama isn't just getting independents and undecideds. He's pulling support away from McCain. This may show Clinton supporters who were naming McCain on general election match-ups with Obama are coming back, or it could mean McCain is just losing support as voters hear more about him. Either way, it's interesting.
It's not Obama's bounce that's interesting. You'd expect that after he won the primary. Its McCain's dip. In other words, Obama isn't just getting independents and undecideds. He's pulling support away from McCain. This may show Clinton supporters who were naming McCain on general election match-ups with Obama are coming back, or it could mean McCain is just losing support as voters hear more about him. Either way, it's interesting. 
