Washington: President Barack Obama kicks off his 100th day in office with a new Democratic ally at his side.
Sen. Arlen Specter will discuss his new Democratic allegiance during an address with Obama and Vice President Joe Biden Wednesday morning.
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Specter ditched his Republican party designation of nearly 30 years on Tuesday, saying he has found himself "increasingly at odds with the Republican philosophy," and declared himself a Democrat. The White House says Obama would campaign for Specter, who's up for re-election next year.
Later, the president is off to Missouri, where he'll hold a town hall meeting at a high school in the St. Louis suburb of Arnold.
Wednesday night, Obama holds a prime-time news conference.