no person who has held the office of President, or acted as President, for more than two years of a term to which some other person was elected President shall be elected to the office of the President more than once.If a person who served more than two years of another's term can only be elected once, then the reverse is also true.
A person who has been elected twice cannot act as President for more than two years of another person's term.
Obama would have to serve two years and then resign, or more likely, not be eligible to act as President in the first place, since the assumption for all Presidents is that they complete their terms.
The office of President is not something to be gamed for personal gain.
-PJ
Sorry, but you need to learn how to read. It’s really as simple as that. Seriously, work on your reading skills. Read what you replied with, and then read it again. If you can’t get it, try it a third time.