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BISMARCK, N.D. (AP) — Democratic Sen. Heidi Heitkamp continues to hold a big fundraising edge over Rep. Kevin Cramer, her Republican challenger.

Federal reports required ahead of Tuesday’s primary show Heitkamp raised nearly $796,000 from April 1 through May 23. That brings her total to date to $10.1 million, with $5.2 million in the bank.

Cramer raised more than $562,000 during the reporting period. Filings show his total to date is $2.4 million, with $1.9 million cash on hand.

The North Dakota race is seen as critical for control of the closely divided Senate.