As polls point to a close presidential election, the country faces the possibility of political chaos - from a repeat of the disputed 2000 election to the remote possibility of a new administration with a president from one party and a vice president from the other.
The most likely result on November 6 will be a clear, if close, victory for President Barack Obama and Vice President Joe Biden or Republican Mitt Romney and his running mate, Paul Ryan.
But with surveys showing the presidential candidates running neck-and-neck just 2-1/2 weeks before Election Day and a number of battleground states still in play, a less straightforward outcome seems more possible.
