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).
2007 amendment to the Constitution of Kazakhstan
In addition to these proposals the Kazakh parliament passed an additional amendment two days later, lifting the term-limit clause on the first President of Kazakhstan, Nursultan Nazarbayev. The constitution limits a president to two five-year terms, but this amendment allows the incumbent president--Nazarbayev--to run for an unlimited number of five year terms. Some critics argued this move paved the way for him to become "de facto" President for life.