Jabberwalker Jabberwalker:
When does (Obama) officially become a "lame duck"?
After November 1, 2016 when the next President is elected. Obama becomes a 'lame duck' as soon as the transistion to the next Administration begins.
Traditionally, Presidents do not make any major policy actions during this period in order to facilitate a smooth transition of power. In the past there have been Presidents who have made lame duck Executive Orders or etc. only to see them immediately reversed by the new President. Thus lame duck actions are viewed poorly and as pointless.
However, a President in his lame duck period is also typified by issuing numerous pardons.