Twenty-second Amendment to the United States Constitution
Some argue that the 22nd Amendment and 12th Amendment bar any two-term president from later serving as vice president as well as from succeeding to the presidency from any point in the presidential line of succession. Others contend that the original intent of the 12th Amendment concerns qualification for "service" (age, residence, and citizenship), while the 22nd Amendment, concerns qualifications for "election", and thus (strictly applying the text) a former two-term president is still eligible to "serve" as vice president (neither amendment restricts the number of times an individual can be elected to the vice presidency), and then succeed to the presidency to serve out the balance of the term (though prohibited from running for election to an additional term).
Term limits in the United States
Prior to independence, several colonies had already experimented with term limits. The Fundamental Orders of Connecticut of 1639, for example, prohibited the colonial governor from serving consecutive terms, setting terms at one year's length, and holding "that no person be chosen Governor above once in two years." Shortly after independence, the Pennsylvania Constitution of 1776 set maximum service in the Pennsylvania General Assembly at "four years in seven". Benjamin Franklin's influence is seen not only in that he chaired the constitutional convention which drafted the Pennsylvania constitution, but also because it included, virtually unchanged, Franklin's earlier proposals on executive rotation. Pennsylvania's plural executive was composed of twelve citizens elected for the term of three years, followed by a mandatory vacation of four years.