From that Politico story I mentioned earlier:

But some attitudes don’t change. Huckabee met in the spring with Pat Toomey, then the president of the Wall Street-backed Club for Growth, which had attacked him during the 2008 campaign for raising taxes in Arkansas.

“It wasn’t very productive,” he said of the meeting. “I realized then that these guys are just what I thought they were — they’re pay for play, and they do it anonymously on behalf of people who don’t want to be known as the funders of these hit operations. I find that repulsive.”

I’m not sure what Huckabee means by “pay for play” here.