The term limit should be ONE term. 6 years. Across the board. President, Senate, House. No worries about who’s butt needs kissing for a second term. Oh, and after you serve your 6 yr. term? No lobbying for 10 years.
I kinda like the six-year idea too. Although I’d put in an extra rule...when you finish up the sixth and final year...you must return to your state of residence where you started...for a period of one-year. That in itself....limits your ability to become just another lobbyists, and carves off value for your future lobby career. Personally, I don’t these guys ever being willing to set up a ten-year period of no-lobbying in the federal capital.
I might also throw in a rule that says the Senate can only meet for 100 days out of the year.