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Rubio raises $6M over last 3 months

By comparison, retired neurosurgeon Ben Carson raised more than $20 million over the same period.
Republican presidential candidate, Sen. Marco Rubio (R-FL) speaks at Civic Hall about the "sharing economy" on Oct. 6, 2015 in New York City. (Photo by Spencer Platt/Getty)
Republican presidential candidate, Sen. Marco Rubio (R-FL) speaks at Civic Hall about the "sharing economy" on Oct. 6, 2015 in New York City. 

WASHINGTON — Sen. Marco Rubio has raised roughly $6 million over the last three months for his Republican White House bid, NBC News confirmed late Thursday.

Rubio's poll numbers may be rising, but the fundraising total is far less than some of his rivals for the quarter that ended Sept. 30. It reflects what supporters describe as a difficult fundraising environment over the summer.

RELATED: Ben Carson raises $20 million in third quarter

By comparison, retired neurosurgeon Ben Carson raised more than $20 million over the same period.

The numbers don't reflect money raised by outside groups, including super PACs, that can raise and spend unlimited sums of money to benefit the candidates.

Additional reporting by CARRIE DANN