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President Barack Obama - President Obama, Sen. John Kerry and former President Bill Clinton are among the Democrat Party's names expected to speak at the Democratic National Convention in Charlotte Sept. 4-6. – Britt Middleton. A former U.S. senator from Illinois, Barack Obama was elected president of the United States in 2008 and he is running for his second term in 2012. He is married to attorney Michelle Obama and they have two daughters, Sasha and Malia. (Photo: Jonathan Ferrey/Getty Images)

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Vice President Joe Biden - Joe Biden served as a U.S. senator representing Delaware for 36 years before being elected vice president under Obama in 2008. He is married to Dr. Jill Biden and has three children. (Photo: Win McNamee/Getty Images)

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Michelle Obama - First Lady Michelle Obama pursued sociology and African-American studies at Princeton University. After graduating from Harvard Law School in 1988, she joined the Chicago law firm Sidley & Austin, where she met Barack Obama. She is the mother of Sasha and Malia. (Photo: Kevork Djansezian/Getty Images)

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President Bill Clinton - Bill Clinton served as president of the United States from 1993 until 2001. He was formerly the governor of Arkansas and is the husband of current U.S. Secretary of State Hillary Clinton. (Photo: Mark Wilson/Getty Images)

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Sen. John Kerry  - John Kerry is a U.S. senator from Massachusetts and was the party's presidential nominee in 2004, running unsuccessfully against incumbent President George W. Bush. (Photo: Brendan Smialowski/Getty Images)

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Julián Castro - Julián Castro is the mayor of San Antonio. He will deliver the keynote address in Charlotte. (Photo: AP Photo/Pat Sullivan, File)

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Rahm Emanuel  - Rahm Emanuel is the mayor of Chicago and the former chief of staff to President Obama. (Photo: Reuters/Chris Kleponis)

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Anthony Foxx - Anthony Foxx is the mayor of Charlotte. (Photo: Reuters/Chip East)

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Kamala D. Harris - Kamala D. Harris is the attorney general of the state of California. Renowned for her fierce defense of homeowners' rights, she is the first African-American and the first Asian-American attorney general of the state. (Photo: Jesse Grant/Getty Images for Obsolete)

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Gov. John Hickenlooper - John Hickenlooper is the governor of Colorado and a former mayor of Denver. (Photo: Aaron Ontiveroz-Pool/Denver Post via Getty Images)

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Tim Kaine - Tim Kaine is a U.S. Senate candidate from Virginia. He is the former governor of Virginia and former chairman of the Democratic National Committee. (Photo: Reuters/Jim Young)

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Cory Booker - Cory Booker is the mayor of Newark, N.J. It appears Booker is back in the campaign’s good graces after he caused a furor a few months back when he criticized an Obama campaign ad. (Photo: Bennett Raglin/Getty Images for Macy's)

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Gov. Martin O’Malley - Martin O’Malley is the governor of Maryland and chairman of the Democratic Governors Association. (Photo: Wikicommons)

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Gov. Deval Patrick - Deval Patrick is the governor of Massachusetts, now in his second term. He is the first African-American governor in state history. (Photo: Mark Wilson/Getty Images)

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Ted Strickland - Ted Strickland is the former governor of Ohio. Additionally, he served six terms as a U.S. House Representative from Ohio. (Photo: Wikicommons)

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Rep. Tammy Baldwin  - Tammy Baldwin is a seven-term congresswoman from Ohio and is currently running for the U.S. Senate. (Photo: Mark Wilson/Getty Images)

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Tammy Duckworth - Tammy Duckworth is formerly the assistant secretary, U.S. Department of Veterans Affairs. She is currently running to represent the 8th Congressional District in Illinois. (Photo: Mark Wilson/Getty Images)

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Eva Longoria - Eva Longoria is co-chair of the Obama for America campaign. She is also an actress best known for her role on the television show Desperate Housewives. (Photo: Stuart Wilson/Getty Images)

Photo By Photo: Stuart Wilson/Getty Images

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Caroline Kennedy - Caroline Kennedy is an author, lawyer and daughter of the late President John F. Kennedy. (Photo: Brendan Smialowski/Getty Images)

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Michael Nutter - Michael Nutter is the mayor of Philadelphia, now in his second term. (Photo: Jeff Fusco/Getty Images)

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Cecile Richards  - Cecile Richards is the president of the Planned Parenthood Action Fund. (Photo: Michael Loccisano/Getty Images for People)

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Nancy Keenan - Nancy Keenan is the president of NARAL Pro-Choice America. (Photo: Brendan Hoffman/Getty Images)

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Sandra Fluke - In February, Sandra Fluke went before Congress to discuss why religious institutions and universities should cover birth control for employees and students. The Georgetown University law student subsequently became a target for conservative radio host Rush Limbaugh, who infamously called Fluke a "slut" who wanted taxpayers "to pay her to have sex." (Photo: Alex Wong/Getty Images)