In an interview with Charlie Sykes, Wisconsin Gov. Scott Walker (R) said vice presidential nominee Paul Ryan should have a more substantive role in Mitt Romney's campaign.

"I was enthused when Mitt Romney picked Paul Ryan because I thought that was a signal that this guy was getting serious, he was getting bold," Walker said. "I just haven’t seen that kind of passion I know that Paul has transferred over to our nominee." The governor suggested that "pushback from some of the folks in the national campaign" was restraining the Wisconsin congressman from making detailed policy arguments.

Walker also suggested that while Romney was in sync with Ryan on policy, he could learn something from his running mate about how to talk about it. "They need to have more of him rub off on Mitt, because I think Mitt thinks that way but he’s gotta be able to articulate that," he said.  

Other Republicans have made similar comments, saying they had hoped Romney would be bolder after tapping Ryan. But Walker -- who has given public advice to the Romney campaign before -- is the most prominent GOP official to voice this idea.