Looking:  The 22nd amendment, a reaction to the four terms of FDR, limits the Presidency to two terms...the ten year exception was included to "cover" for President Truman who became President on FDR's death.   Here's a brief synopsis: "Passed by Congress in 1947, and ratified by the states on February 27, 1951, the Twenty-Second Amendment limits an elected president to two terms in office, a total of eight years. However, it is possible for an individual to serve up to ten years as president."  It doesn't refer just to consecuive terms, but to total terms.  Thus, Bill Clinton, George W. Bush and Barrack Obama are not eligible to hold the office again.    George H.W. Bush and Jimmy Carter could both run again, but they probably shouldn't.   

regards, Gary