Following his bombshell primary defeat in May, Sen. John Cornyn, R-Texas, is facing another blow as his longtime aide is crossing the political aisle to work for the Democrat candidate running to replace him in the upper chamber.

Former Republican Texas Attorney General Ken Paxton, backed by President Donald Trump, is running against Democrat state Rep. James Talarico in a crucial midterm election race that will decide the future of Cornyn’s seat and could determine control of the Senate.

Jacob Smith, who worked for Cornyn for five years as a deputy legislative director and policy advisor, signed up to work on the Senate campaign for Talarico…

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