From the AP http://tinyurl.com/568atj
"Polls are snapshots of highly fluid campaigns. In this case, there is a margin of error of plus or minus 3.5 percentage points; that means Obama could be ahead by as many as 8 points or down by as many as 6. There are many reasons why polls differ, including methods of estimating likely voters and the wording of questions."

From me
If you look at the last 2 elections you can clearly see that polls have poor accuracy of predicting which way a state will vote. Unless God himself is giving these TV guys info on who will win I wouldn’t put much faith into those guys that are already predicting the winner 2 weeks before the election takes place.