February 26, 2007 Giuliani Has Uniquely Broad Based Political Appeal Clinton's popularity concentrated with Democrats by Lydia Saad GALLUP NEWS SERVICEPRINCETON, NJ -- Recent USA Today/Gallup presidential heats measures indicate the 2008 election is not going to be easy for either party. Various pairings of the leading Republican and Democratic contenders generally result in extremely close races. If such early indications are correct, to win, the candidates may need to maximize their support from all sides: their political base, political independents, and even members of the opposing party. Data from the Feb. 9-11, 2007 survey suggest the leading candidates have...