Day 3: Democratic National Convention

Congressional candidates that are running for office and being supported by the Democratic Congressional Campaign Committee appear onstage on the third day of the Democratic National Convention in Philadelphia, Pennsylvania, July 27, 2016.

California delegates hold up signs as they cheer during the third day session of the Democratic National Convention in Philadelphia, July 27, 2016.

Entertainers sing "What the World Needs Now" during the third day of the Democratic National Convention in Philadelphia, July 27, 2016.

Rep. Nita Lowey, D-NY., right, Rep. Paul Tonko, D-N.Y., Rep. Louise Slaughter, D-N.Y., and other delegates sing along as entertainers sing "What the World Needs Now" during the third day session of the Democratic National Convention in Philadelphia, July

Virginia delegates cheer as Democratic vice presidential candidate Sen. Tim Kaine officially become the vice presidential nominee during the third session of the Democratic National Convention in Philadelphia, July 27, 2016.

Delegates cheer as members of the Congressional Black Caucus take the stage on the third day of the Democratic National Convention in Philadelphia, July 27, 2016.

Former Rep. Gabby Giffords, D-Ariz., and her husband astronaut Mark Kelly speak during the third day of the Democratic National Convention in Philadelphia, July 27, 2016

Lenny Kravitz performs during the third day of the Democratic National Convention in Philadelphia, July 27, 2016.

Former New York Mayor Michael Bloomberg speaks during the third day of the Democratic National Convention in Philadelphia, July 27, 2016.

Florida delegates hold up a flag during the national anthem during the third day session of the Democratic National Convention in Philadelphia, July 27, 2016.

Vice President Joe Biden speaks during the third day of the Democratic National Convention in Philadelphia, July 27, 2016.

People cheer during the third day of the Democratic National Convention, July 27, 2016, in Philadelphia.

Democratic vice presidential candidate, Sen. Tim Kaine addresses an enthusiastic audience at the third day of the Democratic National Convention in Philadelphia, July 27, 2016.

A delegate signs during the third day session of the Democratic National Convention in Philadelphia, July 27, 2016.

U.S. President Barack Obama takes the stage to speak on the third night of the Democratic National Convention in Philadelphia, Pennsylvania, July 27, 2016.