The posted article cites Thatcher's "Socialist Ratchet", that is, the observation that liberals/progressives inevitably push government to the left while conservatives merely hold in place before the next move left, and accuses Cruz's now-detractors of perpetuating that tendency when they criticize him for endorsing Trump.
There are understandable arguments on either side of Cruz's endorsement, but I find it ridiculous to suggest that Conservtives who oppose Trump are merely delaying the next grand move to the left. Conservative anti-Trumpers argue that Trump *is* the next grand move to the left.