And what follows is a hash of actual history, but I’ll respond to only a few points.
This statement is almost nonsensical. There were liberal and conservative Republicans and there were liberal and conservative Democrats. Conservative Republicans and conservative (mostly Southern) Democrats joined together to form a conservative coalition that consistently fought against reforms that would benefit black people, until a concatenation of events opened a window for Lyndon Johnson to push through real reform.
You mean, a two-year campaign of hysterical disinformation applied with a trowel by right-wing media (at that time led by AM radio). Constant panic over “gays in the military” and similar sky-is-falling nonsense. And a kick off of the decades-long campaign to paint Hillary Clinton as a supervillain.
The Republicans had comfortable majorities in the House and Senate, and the Democrats weren’t using filibusters as routinely as would happen whenever Republicans found themselves in the minority. Plus, Clinton was still president, and could veto anything, so “They had to do it because their majorities were slim” is nonsense.
The last two presidents? Trump and Obama? Or Obama and Bush? There’s no combination of presidents that makes this statement mean something real. When it comes to political or legislative skill, no president in modern history other than Lyndon Johnson had the mastery and power to get things done like a champion. Of presidents since WWII, Truman, Kennedy, Nixon, and Ford had significant legislative experience, but it didn’t necessarily mean much in terms of wielding legislative power. Obama had only a partial term in the U.S. Senate, but had a lot of state and local experience that put him in the same league.
Carter, Reagan, Clinton, and George W. Bush were all governors whose ability to get legislative majorities had nothing to do with innate skill or “non-callowness.” They relied in varying degrees on their ability to appeal to the public and allies in Congress.
But that’s even besides the point. The system is not set up to rely on a president with a mastery of legislative knowledge can get Congress to bend to his will. It has always been a matter of back-and-forth. But the conservative movement has declared that compromise is heresy, so there’s no longer any back to go with that forth.
As Obama found out when faced with a Congress whose leader declared that his first priority was to deny Obama a second term. What’s the room to compromise with that?