"You take a guy like Cruz, people are liking the Cruz — they think he's for the free market, and [in reality] he's owned by Goldman Sachs. I mean, he and Hillary have more in common than we would have with either Cruz or Trump or any of them so I just don't think there is much picking," Paul said of the Texas senator on Fox Business' "Varney & Company" on Friday.

Surprisingly, the elder Paul seemed more attracted to the views of Vermont Sen. Bernie Sanders, who is giving Hillary Clinton a run for her money in the Democratic primary.

"On occasion, Bernie comes up with libertarian views when he talks about taking away the cronyism on Wall Street, so in essence he's right, and occasionally he voted against war," the former Texas congressman said when asked if there was a candidate who was truly for the free market.

"It's hard to find anybody -- since Rand is out of it -- anybody that would take a libertarian position, hardcore libertarian position on privacy, on the war issue and on economic policy," Paul added.