By Melinda Deslatte and Bill Barrow

Republican Rep. Bill Cassidy handily defeated Democratic Sen. Mary Landrieu, denying her a fourth term and extending the GOP’s domination of the 2014 midterm elections that put Republicans in charge of Capitol Hill for the final two years of President Obama’s tenure.

With Mr. Cassidy’s victory, the GOP will hold 54 seats when the Senate convenes in January, nine more than they have now.

Republican victories in two Louisiana House districts Saturday — including the seat Cassidy now holds — ensure at least 246 seats, compared to 188 for Democrats, the largest GOP advantage since the Truman administration after World War II. An Arizona recount leaves one race still outstanding…

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