I know, I know its early BUT this is interesting. This Zogby poll from 2/26/07 shows Obama over all GOP candidates (see link below):
General Election Match–Ups Show Obama Strength
The Zogby International survey also tested several combinations of possible 2008 presidential general election match–ups, pairing the top three candidates from each party:
Giuliani 47%, Clinton 40%
Giuliani 40%, Obama 46%
Giuliani 46%, Edwards 40%
McCain 47%, Clinton 39%
McCain 40%, Obama 44%
McCain 47%, Edwards 38%
Romney 35%, Clinton 45%
Romney 29%, Obama 51%
Romney 32%, Edwards 47%
Link - Video from Iowa
This is excellent footage for sharing with people still learning about Obama.