The story

The war for Pennsylvania's Democratic delegate votes will be more like a series of battles.

Sen. Hillary Clinton's presidential hopes may rest on the state's more than 4 million Democratic voters as she faces off Tuesday with Sen. Barack Obama of Illinois.

The senator from New York trails Obama by 144 delegates, according to a CNN tally, but a win Tuesday could build momentum for her. The polls close at 8 p.m. ET. Read full article »

CNN's John King contributed to this report.

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