Republican mega-donor Sheldon Adelson sees a lot he likes in the potential 2016 Republican presidential field so far — but he doesn't include Sens. Rand Paul or Ted Cruz on his list of top-tier candidates.

“I didn’t even know Ted Cruz was potentially a candidate until somebody pointed it out to me the other day,” Adelson told the National Journal.

His list of favorites does include Sen. Marco Rubio, R-Fla.; Rep. Paul Ryan, R-Wis.; Wisconsin Gov. Scott Walker; and New Jersey Gov. Chris Christie. Adelson called them all "impressive."

Adelson is a major contributor to Republican causes and candidates, having doled out tens of millions of dollars in the 2012 elections alone, but he isn't quite a kingmaker. Before he donated heavily to Republican Mitt Romney's fail presidential campaign, Adelson bankrolled the failed GOP primary candidacy of former House Speaker Newt Gingrich.