A junk source and poor article to even link to. 629 voters isn't a good sample size for a county that casts well over a million votes.
What Suburban areas / precincts where they getting voters from? They don't even identify a township. Very well likely could have been areas where Obama didn't perform as well in as 2008.
If Obama is polling 60% in Chicago itself, there is no way he is only getting 49 percent of the vote in all of Cook County. The math doesn't add up.
For the general election itself: That's a smaller # of white voters than McCain pulled in 2008. The Suburban #'s are also less than what McCain had against Obama in 2008. Obama only won men by 1% in 2008, but women make up a six percent larger demographic there.
So basically, more white men are voting for Romney this time around. Everything else, he's doing worse than McCain. OK.
You heard it here, Illinois could be lost this year on this 629 person poll conducted by a guy whose right hand polling friend is Dennis Hastert (who has endorsed Romney in 2008 and 2012). No bias at all here.