"We can't judge people by one set of remarks they make," Christie said.
He called the labor groups an “absolute subsidiary of the Democratic Party.”
Rubio panned Christie on support for abortion rights and gun control.
The New Jersey governor said Rubio "has never had a tough race in his life.”
"They have just not acted strongly at all around the world," he said.
"I’m always working to help the people of New Jersey and do my job.”
Christie rises, Carson falls in latest rankings by The Hill.
Candidates are sharpening attacks and ramping up their time and resources in the state.
Trump said the New Hampshire Union-Leader is "like a bully that has been knocked out."
Right to Rise's ad is going up in the early-voting state of New Hampshire.
Joe McQuaid claims Trump is sore about not winning endorsement.
Trump pledged to fix the “corruption and incompetence” in the Department of Veterans Affairs.
Ben Carson and Chris Christie reflected on their difficult upbringings.
He said every American needs to have “skin in the game” to make the tax system fair.
Bush said he wanted to sidestep talk about his family relationships.
“Our pension was never raided to pay for the current obligations," he said.
New Jersey governor rips Rubio's attack ads.
“This president wants to act as if he’s a king, as if he’s a dictator,” Christie said.
Bernie Sanders, Donald Trump, Ben Carson and Chris Christie are among this week's guests.
"They should both try showing up for work," Paul said of his 2016 GOP presidential rivals.
Donald Trump is making his own rules for campaigning in Iowa and New Hampshire.
“By definition, they do nothing,” Christie said of senators running for White House.
Trump said that the New Hampshire Union-Leader's Joe McQuaid is boosting Chris Christie.
Hillary Clinton, Ted Cruz and Marco Rubio look to personalize well-wishes to supporters.