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![Photo: Sen. Michael Bennet](https://www.cpr.org/cdn-cgi/image/width=3840,quality=75,format=auto/https://wp-cpr.s3.amazonaws.com/uploads/2019/06/ap_770470947818.jpg)
Bennet's campaign reported Monday the senator, who is seeking re-election, raised nearly $1.8 million in the first quarter of 2016.
Five Republicans seeking to challenge Bennet raised lesser totals.
Colorado Springs businessman Robert Blaha's campaign reported $670,000 cash on hand as of March 31 after raising $1.1 million. Blaha donated $1 million of that to his own campaign.
Former state Rep. Jon Keyser had $200,000 in the bank after raising $300,000.
Also running are El Paso County Commissioner Darryl Glenn, former Aurora city councilman Ryan Frazier and former Colorado State University athletic director Jack Graham.
The GOP primary is June 28.