Is Obama Getting Enough Sleep?

From CBS News' Michelle Levi:

(St. Petersburg, Fla.) Today is Obama's third day back on the campaign trail after his foreign trip and the Illinois senator is showing signs of fatigue. Last night at a fundraiser in Houston, he appeared to mistake his former opponent and current ally, Hillary Clinton, for the controversial pop icon, Britney Spears.

"Now we've got ads about Britney and Paris," Obama said referencing McCain's new ad comparing his opponent to the young celebrities, Spears and Hilton. "At a time when we've got bigger challenges than any time in our history and you're running ads with Hillary and er – with Britney and ah Paris in it. I mean come on. The American people deserve better."

Whoops, sorry Hil.

Earlier Thursday, as Obama prepared to address an AFSCME convention via satellite, the Illinois senator was caught closing his eyes several times before his San Francisco audience tuned in.

Unfortunately for the seemingly sleepy Illinois senator, the upcoming week will likely see serious campaigning from both camps as the candidates edge in as many stops—and as much news—as possible before attention shifts overseas to Beijing August 8th for the start of the Olympic games.

Next week, Obama heads to the battleground state of Ohio where he plans to focus on the economy as he crisscrosses the state by bus.