Trump also went after Marco Rubio during the rally for "sweating like a dog."
Former Florida Gov. Jeb Bush comes in second place at 16 percent.
"I hope you're making a lot of money," Trump told the impersonator.
The event had been scheduled to begin at 7 p.m., but was delayed because of snow.
Welcome to THE TRAIL, your daily rundown from The Hill on all the latest news in the White House, Senate and House races.
All eyes are on New Hampshire, where political-watchers are hoping that some clarity in both parties starts to emerge...
Julian Hattem 02/08/16 06:04 PM EST
The FBI declined to offer new details about the investigation.
CNN says polling showed "no drop in support" for Rubio after the latest debate.
The New Hampshire resident opposed Rubio's views on gay marriage.
The move comes as Rubio seeks a strong finish in New Hampshire's Tuesday primary.
He called the level of public discourse "distressingly banal... an insult to the voters."