Not just Al Franken. Gary Hart's career as a Democrat sank when he was photographed on a boat with Donna Rice on his lap. John Edwards Democratic career ended when it was found he had a love child with a woman not his wife.
Clinton managed to evade the infidelity issues but then stupidly got snared when Lewinski provided a dress with semen on it- and who the hell keeps their clothes with semen on it and doesn't wash it? My wife says set-up and hates Lewinsky but Bill did it to himself.
The bar now - at least for Republicans- is SO LOW you can't crawl under it.