Looks like the Pro Bowl voters went straight down the yardage list, because DeAngelo Williams was the first alternate for the NFC side.
For reference, here's the NFC's top four, with their attempts, yards and TDs:
Adrian Peterson, Minn 320-1,561-9
Michael Turner, Atl 332-1,421-15
Clinton Portis, Wash 291-1,337-7
DeAngelo Willimas, Car 224-1,229-14
Now, not even DeAngelo's mom can gripe about Peterson and Turner, two legitimate MVP candidates. But Portis is the sticky one. He had 108 more yards than Williams, but 67 more carries. Williams had double his touchdowns.
The fact Williams leads all NFL backs (among those with more than 100 carries) with a 5.5-yard per attempt average didn't matter to voters.
The reality is, it probably will next year.