Leading fundraiser Bobbie Kilberg, who had first supported New Jersey Governor Chris Christie, then former Florida Governor Jeb Bush for the Republican presidential nomination, is now backing Florida Senator Marco Rubio.
"The landscape is becoming pretty clear," she told Bloomberg in a phone interview Sunday. "People are going to understand if they want a mainstream candidate to represent the party in a general election, they are going to get behind Marco Rubio."
The six remaining Republican candidates are now competing for access to the money behind more than $100 million raised by Bush's super-PAC.
In the 2012 presidential race, Kilberg said her Washington, D.C.-area bundler network raised $4.1 million for GOP nominee Mitt Romney.