I don't think it could happen....
There has also been some heated discussion on a possible loophole in the 22nd amendment that might allow Bill Clinton to serve beyond his prescribed constitutional limit. There is nothing in the language of the 22nd Amendment that precludes a former president from becoming vice-president. So, for example, Hilary Clinton could run for president in 2008 and name Bill Clinton as their vice-president. Upon the death, incapacity, impeachment, or resignation of the president, Bill Clinton could then assume the office.
There is a statement in the 12th Amendment which appears to cover this loophole, however: "But no person constitutionally ineligible to the office of President shall be eligible to that of Vice-President of the
United States." IMO, Bill Clinton is ineligible to be the VP.