I believe it was a former Dem Speaker of the House that once quipped, "You have no business bing here if you can't drink some lobbyist's wine and eat his dinner and then turn right around and go in and vote against him."...........
Ummmm, Red...you forgot the part about screwing their women. Money, food, and sex...that about sums it up. That's why you enter politics, loyalty and principle be damned.