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Iowa Democrat Catelin Drey on Tuesday defeated Republican Christopher Prosch for an open state Senate seat, flipping the Republican-held seat and breaking the GOP's supermajority in the upper chamber for the first time in three years, according to unofficial results from the Woodbury County Auditor's Office.

Drey secured 55% of the vote in the race to replace late Republican state Sen. Rocky De Witt, who died in June at the age of 66 after a battle with pancreatic cancer.

This is the second time this year Democrats have flipped a Republican-controlled state Senate seat in Iowa, after Democrat Mike Zimmer defeated Republican Katie Whittington in a special election in January.

4 KEY SENATE SEATS REPUBLICANS AIM TO FLIP IN 2

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