McDaniel is right to be upset. It is illegal under Mississippi law to vote in a primary unless you intend to vote for the party's nominee in the general. Ask yourself how many of those blacks who voted in the runoff intend to vote for Cochran in November? Whether or not they already voted in the Democrat primary.
It was a key part of the Cochran campaign strategy to encourage violation of the law by enough Democrat blacks to swing the runoff. They were bragging about it!
And how many McDaniel voters plan to vote for Cochran in November if he is declared the winner?