Newt Gingrich defended his visit with Donald Trump today, praising him for being "a great showman" and a "great businessman."
But how helpful is a Trump endorsement for a presidential campaign?
Fox News polled on this question back in September.
Q: If a candidate receives the endorsement of Donald Trump, would that make you more or less likely to vote for that candidate, or would it not make a difference to your vote?
More likely: 6
Less likely: 31
No difference: 62
(Don’t know): 2