All these old bastards, both sides, know they have the best gig in the USA. Sure, some people insult you, hate you, get mad at you; but others love and cover for you. Then there is the pay, benefits, health care; prestige, travel benefits, fake honor given to you because you fooled enough people to get elected.
Why the heck would anyone give that up?
They all live a life of leisure.....work consists of walking thru hallways looking busy, meeting in congress to vote, and giving speeches and attending fund raisers. The actual work is done by their underlings.