by Evie Stone

A new poll from the Pew Research Center suggests that some voters are suffering from "Obama Fatigue."

48% of respondents told Pew they've heard too much about Obama lately. And the exposure doesn't seem to be helping Obama's brand; 22% say they now view him less favorably than they once did, compared to 16% who like Obama more these days.

Only 26% of those polled said they've been hearing too much about John McCain...but, as with Obama, slightly more respondents (23%) said they have a less favorable view of him than a more favorable view (18%).

But McCain may still have a chance to wear out his welcome. According to the Project for Excellence in Journalism, last week (July 28 - August 3) was the first week this year in which McCain garnered as much press coverage as Obama.