I do realize how dirty Johnson was, Bob. He stole the election from Coke Stephenson- the election to the Senate that ended up making him President. And Johnson screwed up plenty, both by accident and on purpose- the Vietnam War, for example. But- he did more for the cause of civil rights and equality than any president save Lincoln. And I've done the reading- including all five volumes of Caro's biography to date.
Kennedy? he wasn't incompetent, but he didn't achieve what LBJ did. I agree about the sainthood, but no one wants to see any president martyred.
Roosevelt? again, I don't agree. All of these guys, and all their Republican equivalents, operated in an era of election-stealing which was egregious and wicked. We are only marginally better- witness the Bush 2.0 "victory". We probably ought to have election monitors from South Africa in OUR country. Or maybe from Finland or Denmark. But you can't use the fact that their election may have been illegitimate to detract from their accomplishments- and FDR accomplished a great deal. For example, Bush 2.0 did more than anyone gives him credit for to combat AIDS and other diseases, internationally. Most people don't know that, or if they do, they dismiss it.
It's not possible to have a constructive discussion with folks who hate Democrats because they're Democrats- even though they may have things in common with them. We all have to live here, and living here includes putting up with a lot each of us doesn't like. What are the alternatives? Moving to Mars?