WSJ:

Mr. Huckabee said his campaign would be funded by “working people who will find out that $15 and $25 a month contributions can take us from Hope to higher ground,” he said, a reference to Hope, Ark., where he was speaking. But, he cracked: “Rest assured, if you want to give a million dollars, please do it.”

That’s illegal whether he’s asking for his own committee (limited to $2,700 per election) or for a Super PAC (which can take unlimited donations, but per FEC rule a candidate cannot ask for someone to donate more than $5,000 to a Super PAC).