Awareness of Winfrey's support for Obama was equally high across parties, genders and racial groups; leading GOP candidates still lag behind Obama and Clinton in public visibility.
Many more Republicans are able to recall unprompted the names of Democratic frontrunners Hillary Clinton and Barack Obama than can name Rudy Giuliani and other leading GOP candidates.
Hillary Clinton leads all Democrats with 42% of the public saying they have heard the most about her in the news lately.
About half the public believes that press coverage of 2008 presidential candidates has been fair, but there are partisan differences in these evaluations. A plurality of Republicans say the press has been too easy on Democratic candidates.
Heading into their first debate Thursday evening, what Republican candidates for the presidency need most is to gain visibility. The latest News Interest Index survey finds Clinton and Obama are far more visible, even to Republicans.