Strong showings for Beto O'Rourke and Kamala Harris

Of the throng of candidates who came to South Carolina, O'Rourke may have had the best weekend.

Clyburn praised the former congressman from Texas on Friday night, saying his live-stream of a 2016 sit-in at the U.S. House of Representatives helped set the stage for the Democratic takeover of the chamber last year.

On Saturday afternoon, O'Rourke entered the Columbia Metropolitan Convention Center with scores of youthful supporters chanting his name and clanging cow bells. Instead of taking the stage like other candidates, he gave his speech standing amid those supporters.

O'Rourke focused on the plight of children who have been caught up in Trump's effort to stem illegal immigration on the Mexican border.

“In my hometown of El Paso, in a border patrol detention center, there are children sleeping on cold concrete floors with aluminum foil for blankets," he said.

Allen said he heard positive reviews of the speech that Harris gave at the convention Saturday morning. A former prosecutor, she is a first-term U.S. senator from California.

"We have in this White House a president who says he wants to make America great again. But what does that mean?" Harris asked.

"Does that mean he wants to take us back to before schools were integrated? Does that mean he wants to take us back before the Voting Rights Act was enacted? Does that mean he wants to take us back before the Civil Rights Act was enacted? Does he mean he wants to take us back before Roe v. Wade was enacted?"