Could also be a preemptive strike out of fear that Trump will pre-pick her as his VP and upset the entire applecart. Running as a team would be a massive game-changer and having never been done before would gather wide attention even from dems and indies. There would be affinity because both have solid business executive experience and she would articulate more policy whereas Trump is always going to be flying at the 50,000 ft. level. Not only would there be a male-female dynamic but it would put Hillary in a box and give Trump a huge platform to show his support for women.
It looks to me like the RNC is happily in bed with CNN on this one...the RNC morons are allowing CNN to choose who is in the debate.