Steve is endorsed by the following groups:

CONSERVATION
- The League of Conservation Voters gave Steve one of the highest ratings for his voting record on environmental issues (93%).
- The Sierra Club
EDUCATION
- The Wisconsin Education Association Council (WEAC) supports Steve's candidacy and declared that he is "taking a leadership role in the debate over school funding reform."
- Wisconsin AFL-CIO
- UAW Janesville-Madison Area
- MTI Madison Teachers, Inc.
HEALTH CARE
- The Wisconsin Public Health Association declared that Steve is a "Public Health Champion."
- Citizen Action of Wisconsin
LABOR & PROFESSIONAL GROUPS
- South Central Federation of Labor
- Wisconsin Laborers District Council
- International Brotherhood of Electrical Workers
- Wisconsin Peoples Conference (AFSCME)
- Professional Firefighters of Wisconsin
- National Association of Social Workers
WOMEN'S RIGHTS
- Planned Parenthood Advocates of Wisconsin
- NARAL Pro-choice of Wisconsin