I have previously opined that the Presidential race is one for Obama to loose. There is argument around the edges concerning the likely Electoral College vote but most show Obama better placed than Romney. For myself I think the 'Real Clear Politics' current projection which has Obama on 221 vs Romney on 170 with 147 rated too close to call about right at this time (with 270 needed to win).
So it's still looking good for Obama although he won't want too many weeks like the one just gone with his 'bumbling' Press Conference where he was forced to 'clarify' (read retract) his remarks on the state of the economy; the revelation that 'Gitmo', the Cuban Detention Centre he promised to close within 12 months of assuming office was being refurbished to the tune of several millions of dollars (including a soccer pitch for the inmates who are now being offered painting classes and lessons on personal finance) and the appointment of two special prosecutors to investigate leaks of damaging national security information from the White House.
But in the race for the popular vote both candidates are running neck to neck +/- and that raises the question of what would happen if Romney won the popular vote but lost the Electoral College vote. You see there is nothing to prevent an Electoral College elector switching his/her vote. There is no legal requirement for an elector to vote the way he/she is pledged and indeed that was an important and intentional decision of how the Electoral College should function letting human judgement make the final decision.
So I imagine that if Romney won the popular vote by a margin and was close in the Electoral College vote there would be huge pressure on Electoral College electors pledged to Obama to rethink their position. Mind you, wouldn't do much for their 'political' health as Democrats.
An interesting scenario for those of us fascinated with the US political system ... the good, the bad and the ugly.