If the Republican Party had any spine, and they don't, they would purge every RINO from their ranks. Sen Cornyn is but one RINO. There are readily a dozen more that need to be jettisoned.
At the top of my list, and some of the worst offenders are Sen Collins, Maine, Sen Murkowski, Alaska, and the newly elected POS from Utah that took Mitt Romney's place.
These three empower the Dems more than they do the Republicans.