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Joaquin Castro won't challenge John Cornyn for U.S. Senate seat
U.S. Rep. Joaquin Castro will not run for Senate after all, the Texas Tribune reported.
After repeated public signals that he was "all but certain" to challenge Republican U.S. Sen. John Cornyn, Castro, a San Antonio Democrat, has opted to run for re-election rather than pursue what would likely have been a bruising political battle.