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Biden vows to challenge Palin

Call him Senator Nice Guy. One day after Republican vice presidential nominee Sarah Palin wowed her party's convention with a ... <p><a href="http://rssfeeds.usatoday.com/~a/usatoday-NewsTopStories?a=OQEqSW"><img src="http://rssfeeds.usatoday.com/~a/usatoday-NewsTopStories?i=OQEqSW" border="0"></img></a></p><img src="http://rssfeeds.usatoday.com/~r/usatoday-NewsTopStories/~4/383555090" height="1" width="1"/>