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Singer, Griffin Give Combined $5 Million to Super-PAC Backing Rubio

Rubio also scored some Bush defectors.
Republican presidential candidate Marco Rubio arrives at a rally on the campus of Iowa State University on Jan. 30, 2016, in Ames, Iowa.

Republican presidential candidate Marco Rubio arrives at a rally on the campus of Iowa State University on Jan. 30, 2016, in Ames, Iowa.

Photographer: Steve Pope/Getty Images

Billionaire hedge fund managers Paul Singer and Kenneth Griffin each gave $2.5 million to a super-PAC supporting Marco Rubio's run for the White House, bolstering the arsenal behind the U.S. senator as the primary season begins.

The contributions made up more than a third of Conservative Solution PAC's total haul of $14.4 million for the second half of 2015, according to a Federal Election Commission filing on Sunday. Auto dealership owner Norman Braman, who had already given $5 million to the group, added another $1 million during that time period.