His point was that you constructed a straw man and flailed away at that rather than address the OP's actual point. You were pwned by Jhhnn, who actually did address the OP's point. How embarrassing is that?
You also use Carter as an example, when the OP specifically pointed out Carter as the exception. The others held comparatively brief non-political careers, returning to the private sector only when forced to do so by the voters. That was the OP's point, not whether they started life with money.
I'm not at all sure this is noticeably better for the Pubbies. We have Corker here in Tennessee, who is an honest-to-G-d businessman. But in general, seems to me that politicians at the federal level are career politicians. Unless one is wealthy, it's probably difficult to move to the federal level without putting in years at the state level. And certainly virtually none of them voluntarily return to the private sector afterward, except as lobbyists or maybe university professors or administrators.