From Pew via Talking Points Memo:
"Sen. Hillary Clinton is by far the most popular presidential candidate among her own party’s voters, but has among the lowest overall favorable ratings of the leading candidates. In sharp contrast, the front-running Republican candidate, Rudy Giuliani, evokes relatively modest enthusiasm from the GOP base, but is as broadly popular with all voters as any candidate in either party.
The latest national survey by the Pew Research Center for the People & the Press, conducted Aug. 1-18 among 3,002 adults, finds that 55% of voters who offer an opinion of Clinton express a favorable view of her, while 45% have an unfavorable opinion. Other leading presidential candidates, including Clinton’s Democratic rival Barack Obama (64%), have much higher overall favorability ratings.
Yet Clinton is highly popular with her own Democratic base. Nearly nine-in-ten Democratic voters (88%) who offered an opinion of Clinton express a positive view – with 38% saying they have a very favorable opinion. That is the highest percentage that any of the seven 2008 candidates tested – Democrats or Republicans – receives from their parties’ voters."