I don’t think so. McConnell did not put Walker and Dr Oz over the top and therefore lose two very winnable, critical races. That is entirely on Trump.
One question...why did no candidate think they could compete with Walker in GA? Just because Trump endorsed him, he could still lose to someone somewhat competent. Blame Collins and the other cowards for not even entering the race! But I agree that Walker will single handedly blow that race. As for PA, the reason we are losing is the lack of RNC funding, and the fact that Soros is putting 40 million into the state and has run endless Fetterman/Shapiro ads. DM is not competitive either.