The Terrance Group in September of 2010 put Loebsack only up 1 point against Meeks, he ended up winning by 5. Likely he will win by high single digits or low double digits.
They also showed him only up 5 in 2012. He won by 13.
If this polling firm's results haven't shown you that they're utter trash (and possibly the worst overall poster in the country), they actually have a track record of being bad here. Like I said, wouldn't be surprised if they were cooking up numbers to make their incumbents look good.