One last note. In neither 2009 nor 2011 was the voting close. In 2009, Manning received 39 1/2 votes, Brees 7 1/2 votes, Rivers 2 votes, and Farve 1 vote. In 2011, Rodgers received 48 votes and Brees 2 votes. In both years, the Saints went 13-3, only one loss behind the Colts in 2009 and the Packers in 2011.
Compare the individual numbers. In 2009, Manning had 112 more yards and a 0.7 better completion percentage. Drew had 1 more TD, 8 fewer interceptions, and a 9.7 point better QB rating. The numbers were essentially the same, except for interceptions. Manning won in a landslide. Brees actually had the edge because of far fewer interceptions as reflected by the QB ratings.
In 2011, Drew had 833 more yards, a 2.9 better completion percentage, and 1 more TD (though with more attempts). Rodgers had 8 fewer interceptions and a 11.9 better QB rating. Rodgers received 48 of the 50 votes. I get that Rodgers had a crazy year in 2011, but so did Brees, and the voting certainly should have been closer.