U.S. Vice President Joe Biden speaks at the Citizens United for Research in Epilepsy annual fundraising event on Tuesday, June 21, 2011 in Chicago. Gov. Pat Quinn and Chicago Mayor Rahm Emanuel were among the 900 people who attended a fundraiser. (AP Photo/Brian Kersey)

Associated Press
U.S. Vice President Joe Biden speaks at the Citizens United for Research in Epilepsy annual fundraising event on Tuesday, June 21, 2011 in Chicago. Gov. Pat Quinn and Chicago Mayor Rahm Emanuel were among the 900 people who attended a fundraiser. (AP Photo/Brian Kersey)
U.S. Vice President Joe Biden speaks at the Citizens United for Research in Epilepsy annual fundraising event on Tuesday, June 21, 2011 in Chicago. Gov. Pat Quinn and Chicago Mayor Rahm Emanuel were among the 900 people who attended a fundraiser. (AP Photo/Brian Kersey)
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