Those three you mentioned were not Senate material and lost. All three made major mistakes during their campaigns and that is why they lost. Those three are responsible for their loss and no one else.
Everyone misspeaks now and then; does that make it an automatic disqualifier? Should Trump have dropped out after his first gaffe?
The states are entitled to send whomever they want; it's not up to an elitist in DC to accept them or not. Mcconnell should have supported their runs for office because he needed the seats.
Mcconnell didn't reject them because of their supposed lack of qualification; he shunned them because they were Tea Party and he and Boehner Were fending off a surge from their Right.
-PJ