| http://www.w3.org/ns/prov#value | - ton???s to lose.But it???s hardly a lock, especially if Barack Obama can make inroads with a few key constituencies outside of his reliable base of affluent whites, liberals, African-Americans and the youth vote.Here are the four blocs he???ll need to gain traction with if he expects to win Pennsylvania.Senior citizens So far, senior citizens have been unwavering in their support for Hillary Clint
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