Former Rhode Island Gov. Lincoln Chafee is aiming to take down Hillary Clinton.
"We can't do it in a massive piece of legislation," Rubio said.
"I cannot tell you the distress in that family at that time," Terry McAuliffe said.
The former governor said it would be "an extreme poverty" if only one Democrat runs.
The Ohio governor is visiting South Carolina and New Hampshire this weekend.
The Democrat announced he will stay in the Senate.
“Today, our allies trust us less,” he said. “Our enemies fear us less."
Former Sen. Jim Webb said he'll be returning to Iowa next week.
“I think there is a lot of discontent from ordinary people," the senator said.
Kyle Balluck 04/19/15 09:38 AM EDT
McCaskill also said Democrats are not challenging Clinton because of her qualifications.