A video shows the incident taking place in New Hampshire on Tuesday.
The ice cream makers released a video urging New Hampshire to "do it for Bernie."
The super-PAC hired the agency that coordinated President Obama's African-American paid media.
The news outlet accidentally awarded Trump the primary on its website before voting has ended.
The celeb couple was eyed in New Hampshire on Monday and Tuesday.
"If we don't have a border, we don't have a country," he added.
"Because, you know, I have to be careful what I say."
"That means you’re doing something right,” Rubio said.
"I always have to remind people that this is really early in the process," he added.
"It was a great moment," Trump added of his supporter's words.