The May 26 runoff election between Sen. John Cornyn (R-TX) and Texas Attorney General Ken Paxton could be the most consequential Republican primary since the Tea Party era.

This race pits a 63-year-old conservative upstart Vox called “MAGA’s top lawyer” against a 74-year-old four-term incumbent who was, for most of his career, viewed as an old-guard establishment figure.