Whether McCarthy was right doesn’t matter—the public has been indoctrinated for 60 years by the media and the public schools and colleges to think of him as a horrible monster who ruined the lives of innocent people. It’s hard to see much daylight nowadays between the CPUSA and the Fellow Travelers’ Party, otherwise known as the Democrats—so if people are willing to vote for Democrats calling attention to the resemblances to the CP party line is probably not going to have much impact.
If people are willing to vote for Democrats, they’re likely a lost cause, anyway—until they get mugged.