Personally, I could care less what liberals think and the connections they might make with comparing Clinton to JFK; I would expect them to think along the lines of "JFK was good, so if they attack Clinton he must be good, too". Let them add to their shame. It won't make me shy away. Maybe I am misunderstanding you. My point is to bring up the fact these men are corrupt and should not, IMO, be running the Country without repentance.
Given the internet and the rise of talk radio and Fox, there is far less danger from someone like Kennedy than there was 45 years ago. I understand your concern, which is why I make every effort to knock down puff pieces on the Clintons or any of the democrat candidates.
But to many people in this country (and not just liberals, but the great center who isn't ideologically driven) JFK is an historic figure and a hero. There is no getting around it; that is a fact.
Attacks on historical ikons (no matter how undeserved their reputation) are doomed.
Point out the failings of the current crop of democrats all you wish. Continue to track what Bill Clinton is up to. But if the Right should be drawn into a controversy over the reputation of JFK, it will only harm us, and will not advance our efforts one bit. We will be portrayed as vindictive loonies, which although may not bother you personally, will make it darn difficult to win elections.