FROM CNN's Jack Cafferty:
Just under three weeks to go before the Pennsylvania primary, which seems like an eternity in the epic struggle between Hillary Clinton and Barack Obama.
History suggests that the more time Obama has to campaign somewhere, the better he does. A new poll seems to bear this out. The Quinnipiac University poll shows Clinton with a 9-point lead over Obama... 50% to 41%,that's down from a 12 point lead two weeks ago.
Also, Obama continues to rack up endorsements from some pretty key figures.
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