Sen. Bernie Sanders tries tonight to calm his angry supporters during his prime time address at the Democratic National Convention in Philadelphia, Penn.
Sanders made the case for backing Hillary Clinton for president by warning what a Donald Trump presidency would look like.
"By these measures any objective observer will conclude that based on her ideas and her leadership, Hillary Clinton must become the next president of the United States," Sanders told a crowd of thousands.
He received a rousing welcome by his supporters. The first day of the convention was all a buzz over leaked emails showing Democratic Party leaders hostile toward Sanders' presidential primary campaign. Tonight, he tried to transcend that controversy.
"Together, my friends, we have begun a political revolution to transform America and that revolution — our revolution — continues," he said.
Clinton did review Sanders' planned remarks before he took the stage.
Meanwhile outside the convention hall, hundreds of protesters gathered; 18 of them were arrested.
A sit-in was held near a lamp post flying Mississippi's state flag, which includes the confederate emblem. Police were heckled when they stopped protesters from climbing the pole to remove the flag.
And not far away, for more than a half hour they tried to break through the police barricade but failed. They also changed "We won't vote for Hillary."
And it isn't just extremist protesters — many of these people are delegates.
"I personally, as a Bernie Sanders delegate, will not vote for Hillary Clinton unless she makes large changes," says Trevor Trabor, a Sanders delegate from California.
A number of the protesters are affiliated with the group called "Democracy Spring" or "Never Hillary."