When the number of points in the spread are politically important, and the race is between two people, the reporting should not be to the nearest percent, but the nearest percent / 2. So PA is 54.5% for Clinton to 45.5% for Obama - correctly showing the 9 point spread, when rounded to the nearest point. Yes, no one cares about 45.39% compared to 45.5%, the rounding beyond the .5% is not significant to the political discussion. But it would clutter neither or minds nor the page to add those .5's to the figures, and round to them.