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.
Quinnipiac University found that most voters associate the word “liar” with Clinton.