A weak president like JFK would definitely be in the USSR’s interest
I totally disagree.
The Cuban Missle Crissis, the Bay of Pigs, an AG's war against organized crime all done by a moderate president belonging to a party the Soviets were trying to infiltrate.
That kind of president and that kind of Democrat was not in the interest of the Soviets.
And the effect on the Democrat party was chilling. Democrats from that point forward started acting in support of anti American and pro Soviet interests.