He ran. He lost. There are no do-overs.
Did the Democrats unjustly slime him? No doubt. Does anyone think that Democrats will play nicer in 2020? Insanity is doing the same thing over again and expecting different results.
This is a seat that the Republicans can and should win back. They will not win it back if Moore is the nominee.
Nixon, Ronald Reagan & George W. Bush all lost elections, only to win later on.