USASpending.gov:

Top 5 Contractors
Wisconsin Physicians Service Insurance Corporation $161,241,933
Didion Milling, Inc. $28,254,732
University of Wisconsin System $21,021,695
Facility Leaders In Architectural/Engineering Design, P.C. $20,405,886
Metastar Inc $19,600,777

Complete list of 2nd Congressional District contractors.

Top 5 contractors: State of Wisconsin:

Top 5 Contractors
Oshkosh Corporation $1,481,203,487
General Electric Company $248,269,326
The Manitowoc Company Inc $178,329,866
Wisconsin Physicians Service Insurance Corporation $161,241,933
National Presto Industries, Inc. $125,773,563

Complete list of 2008 Wisconsin contractors.