The Kentucky Senator and prospective GOP presidential candidate — whose libertarian politics mesh with those of the billionaire mega-donor brothers Charles and David Koch — appeared at the annual winter meeting of the Koch donor network wearing a boxy blue blazer, faded jeans and cowboy boots.

Some attendees commented that Paul’s appearance was “cavalier,” said Frayda Levin, a Paul supporter and major donor who attended the conference at the Ritz Carlton in Rancho Mirage, California. It was organized by Freedom Partners Chamber of Commerce, the non-profit hub that oversees the Koch network. “This is an older crowd and much more establishment crowd. They are used to a Romney. They are used to a Jeb Bush,” Levin said…

During a Sunday afternoon speech at the Koch forum , Paul drew skepticism among some donors by touting tax breaks as a means of spurring economic growth in blighted inner cities. That stance is anathema to the brand of small-government conservatism espoused by the industrialist brothers and many of their network’s donors, who object to marketplace interference. Even Levin admitted she was “a bit surprised. But he’s just exploring ideas right now. People didn’t quite understand where he was coming from.”

Donors were further put off by Paul’s performance later that evening in a forum for prospective GOP presidential candidates that also featured Sens. Marco Rubio of Florida and Ted Cruz of Texas. At times slouching in a cushy arm chair, Paul, with his legs crossed, gave rambling answers that contrasted sharply with other participants.