You can’t run those kinds of ads because McConnell is damaged goods when it comes to Conservatives. The first time Tillis (or anyone) ran an ad like that FR alone would light up like a Chrismas tree with “Burn the RINO Shill at the Stake” threads.
The fact is that Tillis and Roberts now appear to be the only winnable-race Republicans who are in trouble. The others seem to get it, and are leading if not pulling away. And marginal GOP candidates (like in IA) are starting to as well.
That means Tillis is an outlier, which reflects upon how he is conducting his own campaign, alone.
For the masses, it's a message that will still work.
-PJ