All I can say is that elections are not term limits. You have to have a hard and fast rule that eliminates a person's ability to hold an elected off more than 2 terms, period, just like the prez. I would like to see a limitation that also limits them to one branch- either the house or the senate, no doubles.
Then you take away the freedom of an individual to choose who they wish to vote for in an election. I have to side with Madison on this one.