It is more than his Voting record...
John Cornyn fed reporters attack points to use against Ted Cruz.
This story hit the day after Breitbart broke news McConnell and Cornyn were leading an inside plot to sabotage Cruz.
In 2009 - Cornyn betrayed DeMint. Cornyn BETRAYS DeMint, Issues a Memo to GOP Senators and Senate Candidates promoting Obamacare’s passage.
http://cornynlovesobamacare.com/timeline/cornyn-issues-a-memo-to-gop-senators-and-senate-candidates