O'Rourke endorses Biden at Dallas rally on eve of Super Tuesday, as ex-VP appears to offer gun-control role

In a surprise moment at the end of his Dallas rally on the eve of Super Tuesday, former Vice President Joe Biden called former Texas Rep. Beto O'Rourke up to the stage -- and vowed to put O'Rourke, who has said the government should forcibly seize assault rifles from Americans, in charge of gun-control efforts.

Also at the rally, Biden accepted the endorsements of onetime rivals Pete Buttigieg and Amy Klobuchar, as the Democratic party's moderate wing rallied behind Biden to challenge frontrunner Sen. Bernie Sanders, I-Vt., on the eve...