Clinton, Obama Fight for Pa. Votes

PHILADELPHIA — Older, whiter, and more female than the nation as a whole, Pennsylvania looks like Hillary Clinton country. Wealthier, better educated, and more African American than the rest of the state, Pennsylvania's thickly settled southeast corner could belong to Senator Obama. For six weeks, the two Democratic presidential rivals have courted their political bases and sought to carve up each other's support with an increasingly tart tone. After both deluged the state with ads, crisscrossed it on buses, planes, and trains, and had a parade of surrogates march through it, Senator Clinton holds a slight lead.

Pennsylvania's primary today could be decisive, or it could extend a campaign that has lasted longer than most ever imagined.