FOX News analyst Brit Hume explains that the presidential polls this year give Obama on average a seven point advantage.

“There is considerable heartburn among Republicans these days over polls that seem to have a disprortionate number of Democrats responding… In a strong year for Democratic candidates more people will say their Democrats and vice versa… Four years ago in a very big for Democrats election day exit polling showed more Democrats voted than Republicans by seven percentage points. The same margin by the way that Barack Obama won the election. Not many people believe as many Democrats will vote this year. Yet a compilation of all recent polls by Pollster.com showed samples contained on average more Democrats by, you guessed it, seven percentage points.”