For President Obama, a politician of famous good fortune, even scandals within his administration seem well-timed.

Obama seems to have been untouched by the unfolding investigation involving former CIA director David H. Petraeus and Marine Gen. John R. Allen, the U.S. commander in Afghanistan, so far. 

A Washington scandal is rarely helpful, and any distraction is unwelcome as Obama begins negotiations this week with congressional leaders about how to avert year-end tax increases and spending cuts that could push the economy back into recession.

But at least for the moment, as Obama holds his first post-election news conference Wednesday, the partisan calculus that has defined Washington for much of his first term has been scrambled.

See the full story by Scott Wilson here.