It’s easy.
Did McKennedy open his mouth?
Then he lied.
Did he have a pulse?
He lide.
Was he moving?
He lied.
Ergo, he’d loose a debate with a chair.
A great debater is he. At some point or another, McCain has either argued for or against or against and for every issue put to congress in the last thirty years. You can’t find an issue that he hasn’t crossed an aisle on at least once.