Raise your hand if you thought the filibuster would be a top issue in the most important Republican Senate primary of this year’s midterm elections.

Congratulations if that was your guess. The likelihood that many would have made that prediction is small. Nevertheless, that is exactly where Republicans find themselves in the May 26 runoff between Sen. John Cornyn (R-TX) and Texas Attorney General Ken Paxton, who has positioned himself as the 74-year-old, four-term incumbent’s more-MAGA-than-thou challenger.