A second Republican has filed to run for the last two months of former U.S. Rep. Thaddeus McCotter's term, triggering a $650,000 special primary election.
Former state Sen. Nancy Cassis filed 2,000 signatures Friday to run in the Sept. 5 special primary.
A special primary might have been skipped if only one Republican and one Democrat filed, letting voters in the Nov. 6 general election chose who serves through 2012.
Local governments have complained about the added expense.
Cassis says she regrets the cost, but couldn't chance the seat going to Democrat Dave Curson or Republican Kerry Bentivolio.
She has been critical of Bentivolio for starring in a low-budget Michigan-made satiric movie released last year that blamed former President George W. Bush for the terrorist attacks of Sept. 11, 2001.