After billions of dollars spent, more than a million advertisements aired and hundreds of thousands of new voters registered in key states, this is how close elections are won: volunteers amped up on too much coffee and too little sleep, trudging from door to door, desperately seeking one last voter. For the third time in four elections, the margin between the winner and loser in a presidential campaign seems on track to be less than 2.5 percentage points. Final polls released Sunday showed the national vote close, with President Obama holding a small edge over Republican Mitt Romney both in the popular vote and in most hotly contested states. The candidates spent Sunday swooping through...
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