Bingo.
There are truly skilled politicians like Bill Clinton. He'll bs you, you know he's bs'ing you, but you know what? He sells it so well that you walk away thinking he believes his own bs. He's an authentic bs'er.
Then there's the JD Vances of the world. He's bs'ing you, and you know he's bs'ing you because he looks so damn uncomfortable doing it. He can't sell you anything because of that.
That probably means he's a better human being deep down, but it also means he's a rank bs'er and a likely loser.