Sierra Club
Top candidates
| 1. Barbara Boxer, Democrat | $9,300 |
| 2. Patty Murray, Democratic | $3,500 |
| 3. John Kerry, Democrat | $3,000 |
| 4. Mark Udall, Democratic | $2,700 |
| 5. Maria Cantwell, Democrat | $1,800 |
Top committees
| 1. Friends Of Barbara Boxer | $7,300 |
| 2. California League Of Conservation Voters | $5,250 |
| 3. Emily'S List | $4,500 |
| 4. League Of Conservation Voters Environmental Voter Inc | $4,100 |
| 5. People For Patty Murray U S Senate Campaign | $3,500 |
