Just write in McDaniel, or stay home.
I've been done with the Republican Party for years. I don't support any of the GOP organizations and my vote only goes to individual conservative candidates.
What Cochran and the GOP did is unprecedented and has deepened the schism between the grassroots & the establishment.
Vote but for other candidates.. just leave Senate ballot blank.
It’s not unprecedented. McCain pulled this crap in Michigan in 2000, getting busloads of Detroit Democrats to vote for him in the Presidential primary over Dubya (who would never vote GOP in the general).
If it can be demonstrably proven that a candidate used such tactics where it made the difference in a close race (as this one in MS did), they should be immediately stripped of their nomination. They did it here in TN, except it was Democrats who did so with a sitting State Senator where we have an open primary.