Minnesota "Closer?"

A reader writes:

I'm a student at Carleton College who has contributed (financially and with my time) to the Obama campaign. I just got an automated call from Jeff Blodgett, the chair of the MN campaign. The text of the call was:

"Hello, this is Jeff Blodgett from the Minnesota for Obama campaign. Our initial data shows this election is significantly closer than the polls predicted. We are putting out an urgent call for volunteers... We are organized groups to knock on doors at five P.M., or earlier if you can, for our final GOTV operation." This was followed by different numbers to call based on your residence.