I wouldn't vote for him, but if you have to make nice with some people in the establishment, you want them to be in a significant position (McConnell's the senate minority leader) and you want to be able to work with them somewhat... McConnell came out in support of Rand during the filibuster and has teamed up with Rand to work towards hemp legalization.
Now, if by supporting McConnell, Rand is able to help deny establishment support for Graham then that could be a huge win. This is the main battle ground that I see.
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