I think he's in trouble if he's only getting 52% support. I ran unopposed in '08 and got 68% in '06. Big drop right now. That is potential for him to be defeated.
Democrat polling over 50% in a conservative rural district in 2010 = good
I'm not surprised he's drawing a majority. He has represented the district for TWENTY years. Come election day it wouldn't surprise me to see him lose though.
I seriously doubt many voters who are supporting Boucher now would change their mind before election day. I also expect Boucher to get a decent share of undecideds in the end.