"We shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe, in order to assure the survival and the success of liberty." John Fitzgerald Kennedy, Inaugural Address 1961
He was FAR to the right of any current major democrat officeholder, but still left of Reagan, Goldwater or even Nixon. That "wing" of the democrat party pretty much disappeared in 1972, and hasn't been seen since. JFK also cut taxes, which is anathema to the socialists that now hold the reins of his party. They should just rename themselves the Socialist Progressive party or some such.
The bigger question is where did those voters go?