NumbersUSA, an issue advocacy group focused on decreasing legal immigration to the U.S., has already been on the air attacking Graham on immigration, and group head Roy Beck promised it will stay involved in reminding voters about Graham’s work on the issue. But he admitted defeating the senator will be tough.

“He's very much a tool of the corporate lobbies and basically during last spring you had the various lobbies saying 'don't worry, we'll be there for you.' They've promised to provide lots of money and with that many billionaires that gives you lots of guts to go after your constituents,” he said. “He's been trying to show himself as anti-Obama and really conservative on a lot of issues, like Rubio is, it's like they know it's not where the GOP base wants them to be but if they can do that for their corporate friends and then show they're super-conservative on other things and hope voters forgive them, it very well may work.”

By Cameron Joseph in The Hill

Updated: Wed, Aug 21st 2013 @ 11:10am EDT