Oh Matt Salmon.
You're one of those strange, rare cases in American politics where someone actually sticks to their word despite how detrimental it may be to their political career — because they don't view politics as a career.
Salmon, who is in his second stint representing Arizona in Congress, last week proposed an amendment to the United States Constitution that would place universal term limits on members of Congress, restricting representatives to three two-year terms, and senators to two six-year terms. His bill would also restrict people from running for those offices again after taking a leave into the private sector — though it doesn't appear that the language of the amendment would restrict people from chasing a Senate seat after completing their time as a representative.
Not as if that matters though, as the bill (which has six co-sponsors) would not only have to pass a two-thirds majority of Congress, but would then have to be ratified by three-fourths of the states — in other words, this has practically no chance of passing.
Of course, the irony here is that Salmon is currently in his fourth term in Congress, meaning that if his amendment had already existed, he couldn't be serving again — though it would also mean that Jeff Flake (who entered Congress alongside Salmon, making the same initial promise of stepping down after serving three terms before reneging on his word) would be gone as well...which probably would have spared his ego from viewing the ass-kicking he's taking in public polling right now.