Vice President Biden could take on a critical role in the 2012 campaign, stumping in battleground states where President Obama has fallen out of favor among core constituencies.

Democrats reportedly are working on a plan to send Biden out to the three major political battlegrounds of Ohio, Pennsylvania and Florida. Those states are key to any presidential victory, and states Obama won in the 2008 election. But recent polling from those states shows the president just about tied with potential Republican challengers in the 2012 election, and voter attitudes toward the president souring.

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