The last time John Cornyn was in a primary runoff, it was 28 years ago and he easily won.
Things have changed a bit since then.
Texas is a far redder state, President Donald Trump is the undisputed kingmaker and primary voters are more conservative and willing to look past candidates’ scandals and personal baggage. All those changes are coming to a head as Cornyn enters a runoff against Attorney General Ken Paxton in his bid for a fifth term in the Senate.