Trump said the Univision anchor was "ranting and raving" during a press conference.
O'Malley urged the party not to "circle the wagons" around the front-runner.
Christie said more should be done to enforce gun laws already on the books.
Biden is reportedly sitting down with AFL-CIO President Richard Trumka.
She argues the Republican Party is out of touch with modern-day America.
Paul said "bullying people" won't help the group get its message out.
Priorities USA hit the Republican Party over comments on immigration.
Tom Harkin, a Clinton supporter, said Biden could serve as Clinton's secretary of State.
Sen. Bernie Sanders's record on social justice won him over.
The Quinnipiac survey also finds Biden beating Bush, Rubio.