Three weeks before the midterm elections on Nov. 2, Vice-President Joe Biden's mission is almost impossible: convincing anxious voters that the $814 billion stimulus measure is working in states where Democrats are in danger of losing the most House and Senate seats.rnAs President Barack Obama's emissary to middle-class voters, Biden in the past month has visited 27 cities in 17 states, stumping for 24 Democratic candidates. Eleven of those stops were in working-class neighborhoods of Pennsylvania and Ohio, where Obama was defeated in the 2008 primaries and where Biden's middle-class roots-he grew up in Scranton, Pa.-may be an asset.
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