By denying Medicaid expansion in their states, many Republicans are denying health insurance to many constituents. By voting or campaigning to repeal "Obamacare" many Republicans are trying to take health insurance away from many constituents who have just gotten it for the first time.
If a Republican were to succeed in repealing "Obamacare," how many people in his state would lose health insurance?
How many of those people would be expected to die each year who otherwise would not?
(In some states, it could be hundreds.)
A Democratic ad should put in the correct numbers for a given state and attack that Republican. So far a mundane boring truthful ad.
They should not stop there.
Truthfully label that Republican an (attempted) mass murderer.
Senator _ is trying to kill hundreds of __ians each year!
You can stop him! Vote no on Senator _.
More generally, much more ruthless tactics than currently used by Democrats, without copying the rightwing tactic of continual lies, could help get more Democrats elected.