Ryan told The Daily Caller in an exclusive interview that Cain’s plan shows the GOP presidential campaign season has entered into a more advanced stage where ideas — not just personalities — have come to the forefront.

“We need more bold ideas like this because it is specific and credible,” Ryan said. “I’m more of a flat-tax kind of a guy.”

The budget chairman went on to say that ideas like Cain’s plan could help shape the debate over tax reform moving into 2013.