Protesters Flood Philadelphia Ahead Of Democratic National Convention

Bernie Sanders supporters gather in a public plaza before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Environmentalists and Bernie Sanders supporters start to gather for a march before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

A woman directs people to register to vote before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Police stand in a public plaza as marchers gather before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Bernie Sanders supporters gather in a public plaza before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Environmentalists and Bernie Sanders supporters start to gather for a march before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Environmentalists and Bernie Sanders supporters start to gather for a march before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Environmentalists and Bernie Sanders supporters start to gather for a march before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Environmentalists and Bernie Sanders supporters start to gather for a march before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Hundreds of environmentalists and Bernie Sanders supporters march through downtown before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Bernie Sanders supporters gather in a public plaza before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. The convention officially begins on Monday and is expected to attract thousands of protesters, members of the media and Democratic delegates to the City of Brotherly Love. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Hundreds of environmentalists and Bernie Sanders supporters march through downtown before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Activists march through downtown before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Activists march through downtown before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Philadelphia Prepares To Host Democratic National Convention

Workers assemble the podium at the Wells Fargo Center July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Aaron P. Bernstein/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Activists march through downtown before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Activists Rally In Philadelphia Ahead Of The Start Of The Democratic National Convention

Activists march through downtown before the start of the Democratic National Convention (DNC) on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Spencer Platt/Getty Images)

Philadelphia Prepares To Host Democratic National Convention

Workers prepare the podium ahead of the Democratic National Convention at the Wells Fargo Center, July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Drew Angerer/Getty Images)

Philadelphia Prepares To Host Democratic National Convention

The convention floor is seen at Wells Fargo Center, July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Aaron P. Bernstein/Getty Images)

Philadelphia Prepares To Host Democratic National Convention

Signage is seen in the parking lot of the Wells Fargo Center July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Aaron P. Bernstein/Getty Images)

Philadelphia Prepares To Host Democratic National Convention

Balloons fall from the roof of the arena as setup continues for the Democratic National Convention at the Wells Fargo Center on July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Joe Raedle/Getty Images)

Philadelphia Prepares To Host Democratic National Convention

Workers move the podium ahead of the Democratic National Convention at the Wells Fargo Center, July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Drew Angerer/Getty Images)

Philadelphia Prepares To Host Democratic National Convention

A worker uses a level on signage ahead of the Democratic National Convention at the Wells Fargo Center, July 24, 2016 in Philadelphia, Pennsylvania. (Photo by Drew Angerer/Getty Images)