Democrats haven't been "inspiring and popular" since JFK. Their steady shift to the left becomes more unpopular and uninspiring each time a Democrat President is elected.
Look at their history: JBJ is regarded as one of the worst presidents of the 20th century. He kept us bogged down in the Vietnam war and his social programs gave us urban blight, massive ghettos, and soul-killing entitlements in the black community from cradle to grave.
Bill Clinton was a joke. He was impeached for lying about having sex in the oval office, and his incompetency set the whole country up for the 9/11 attacks. That idiot actually lost the nuclear codes for a month
Obama didn't accomplish anything except giving rise to al Qaeda, making Mexican drug cartels rich, wasting billions on bogus "green energy" companies that later went bankrupt, dividing the country worse than it ever had been, and legislating a scam called "Obamacare", which did nothing but increase the Medicare and Medicaid rolls.
That brings us up to where we are now: Joe Biden. And if I have to explain how much of a failure that idiot has been, you really haven't been paying attention.