The Chicago Sun-Times digs into the most recent Gallup poll and comes up with an interesting number: Despite relentless media coverage of Barack Obama in recent days, one-third of Americans still don't know who he is. Another 14 percent say his name "sounds familiar" but haven't formed an opinion. While that's not terribly surprising given that he's a freshman Senator, it suggests another interesting layer in the equation should he and Hillary Clinton run against each other: While impressions of Clinton are pretty well established in the minds of the vast majority of voters (though they can of course change), Obama is a completely blank slate to nearly half the electorate.

Meanwhile, Obama is on vacation in Hawaii, where he will make up his mind on whether to run, the Sun-Times reports.