I am very hard pressed to remember anything of great importance done by Kennedy except get assasinated.
NASA was cool, and redecorating the White House...oh wait, that was Jackie.....never mind.
The largest yax cut in U.S. history stands out among other things.
A couple of really cool speeches, lots of great Life magazine photos, and the cool "Camelot" thing really charged up a lot of people.
I can't remember because I was a little kid when JFK was president. I do remember when he got shot, though. My aunt called my mother and she started crying on the phone. Crying because the President had been killed! I doubt that too many would have felt great sadness if Carter, Johnson, or Clinton had received the same fate. Things have changed, and the democRATs have moved considerably to the left since then.