A person called into Carr’s show from a Connecticut phone number to ask why people should vote for Brown instead of New Hampshire's other GOP Senate candidates.
“Well, they can come over and do same-day registration and say they want to come down and vote," Brown said, drawing laughter from Carr. "So if they feel compelled to do so, come on down.”
A spokeswoman for Brown, Elizabeth Guyton, told Boston.com that the Senate candidate was “clearly joking.”
Brown himself just relocated to New Hampshire in December after living much of his life in Massachusetts, where he won the race to replace the late Sen. Ted Kennedy (D-MA) in 2010. He made his New Hampshire Senate run official in April.
A Granite State poll released last month found Brown barely trailing incumbent Sen. Jeanne Shaheen (D-NH) 44 percent to 46 percent. The Polltracker average has Shaheen leading Brown 48 percent to 45 percent.