Buzz continues to build around a potential Mitch Daniels presidential run.

The Indiana governor will be the keynote speaker at the Tennessee Republican Party's Statesmen's Dinner in Nashville on July 15, CNN reported. The Tennessee GOP has played host to presidential candidates before. Former Minnesota Gov. Tim Pawlenty gave the keynote address at the event last year.

And top Republicans in Iowa are talking up Daniels's "substance."

Sen. Chuck Grassley (R-Iowa) noted he might lack charisma, but he's considered supporting him.

"But sometimes I hear Mitch Daniels, and I've thought, ‘Well, maybe I ought to back him, because it would be an opportunity to show that people that don’t have charisma can be elected president,' " Grassley told the Sioux City Journal.

"The point being that he seems to be a very, very good governor, has a good record; he had a good record as OMB director; he has worked for other things. But he is a person of substance, and substance matters."