National Poll: Obama 50% - McCain 38%; Clinton 46% - McCain 46%

CBS Poll:

When all registered voters were asked who they favored in a head-to-head general election match up between Obama and McCain, Obama led by 12 percentage points, 50 to 38 percent.

In a Clinton-McCain match up, registered voters were evenly split, with 46 percent backing each candidate.

Obama beats McCain by 10 points among independents, while McCain beats Clinton by 17 points among that group.