Former Democratic state lawmaker Mike Katz won Delaware’s Republican Senate primary Tuesday, sending the state’s GOP-backed candidate into a November fight against the Democratic nominee for a seat Republicans have not won in more than three decades.

Katz defeated retired Army colonel John Shulli in the two-way Republican primary and will face three-term Democratic Sen. Chris Coons in the Nov. 3 general election.

Katz, a pediatric anesthesiologist and business owner, previously served in the Delaware state Senate as a Democrat after winning election to the chamber in 2008. He represented the state’s 4th Senate District until losing his…

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