Matt Bevin lost his Kentucky Republican primary race against the Senate minority leader. (Mike Lawrence/The Gleaner via AP)

The price tag of businessman Matt Bevin's primary loss to Senate Minority Leader Mitch McConnell (R-Ky.): a cool $5.3 million.

A review of Bevin's most recent quarterly fundraising report, which was filed with the Federal Election Commission last week, also shows he loaned his campaign nearly $1.6 million of his own money, which he has yet to repay. He raised an additional $3.8 million from donors.

McConnell skated to victory in the May 20 primary, defeating Bevin, who ran to his right, 60 percent to 36 percent.

Bevin's spending is easily tops among challengers who tried to unseat sitting U.S. senators in a primaries this year. So far, no senator has lost.

Still, McConnell had to work for his win. He spent a whopping $11.6 million through the end of June, much of which was for the primary.

McConnell still started the month with a healthy $9.8 million in his campaign account for the general election against Secretary of State Alison Lundergan Grimes (D). But Grimes has been one of the best fundraisers of the midterm campaign so far. She continues to narrow the available cash gap, ending June with $6.2 million on hand.

Bevin ended June with about $60,000 in his account. His debt load is nearly $1.3 million.