Google shows two hits for this number;
KLD marketing Research
and
Porter Home.
I don't know which one called, because I didn't pick up and no message was left on my voice mail.

answered call but other end of the line hung up. Sounded like it was automated.

Said doing research regarding the Eden Prairie, MN schools and a levy.

No message left on answering machine but found this online: http://www.myspace.com/jemresearch and site contains the number!