PHILADELPHIA (AP) -- Barack Obama has been greeted by the largest crowd of his campaign at a rally near the nation's birthplace.
Some 35,000 people jammed into Philadelphia's Independence Park last night to see the Democratic presidential candidate ahead of Pennsylvania's primary Tuesday, the biggest prize remaining on the campaign schedule.
The crowd exceeded the 30,000 people who attended a December rally in South Carolina where Obama was joined by Oprah Winfrey.
During the Philadelphia event, Obama alluded to the founding fathers by saying that the patriots came to the city "to do something that no one in the world believed they could do."
Obama also called Democratic rival Hillary Clinton a "tenacious" opponent but said it's time to move beyond the politics of the 1990s.
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