Granted, the wealthy are often a poor barometer for election results: Mitt Romney was their favorite candidate in 2012. What's more, being seen as the favorite candidate of the rich could ultimately be seen as a liability in an especially populist election cycle.
Yet because the wealthy now play an outsized role in campaign financing, the poll could signal a wave of cash moving toward Rubio and away from others on the Republican side.
The survey is also the latest evidence that the wealthy are quickly coalescing around Rubio as their favorite candidate. This week, billionaire hedge fund manager Ken Griffin and Art Pope, owner of Variety Wholesalers, publicly endorsed Rubio. Both are major donors to the Republican Party.
Paul Singer, another hedge fund billionaire, is also backing Rubio, and billionaire Florida car magnate Norman Braman has been a longtime supporter.
In their endorsements, Rubio's rich backers say they like his experience, up-by-the-bootstraps life story and his vision for the country, which includes lower taxes, smaller government and a tougher American posture overseas.
"If Rubio starts getting more of this money, that could swing things his way and bring him a lot more awareness," Walper said.