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Montana voters will pick a new U.S. House representative in May, with little idea of who has been spending money in the special election.

The state’s election to replace Republican Ryan Zinke in Congress ends May 25, just 71 days from now. Federal campaign spending laws require candidates to file only a few spending reports during that time. Third-party groups will report once.

That means there will be few details about a race that in two weeks has attracted more than $800,000.

“This is the nature of special elections when you have a short time frame,” said Jeremy Johnson, Carroll College political science professor. “You will eventually find out about what’s being spent after the election is over.”

The election officially started March 1, when Zinke resigned his House seat to lead the Department of Interior. Gov. Steve Bullock then set the election deadline for the Thursday before Memorial Day. The state’s Democrats, Republicans and Libertarians then selected candidates last week.