Campaign finance data for Wisconsin's 1st Congressional District: 4 candidates raised $10.3M.
| # | Candidate | Party | Raised | Spent |
|---|---|---|---|---|
| 1 | STEIL, BRYAN GEORGE | REP | $5.6M | $4.9M |
| 2 | BARCA, PETER | DEM | $2.3M | $2.3M |
| 3 | BARCA, PETER WILLIAM | DEM | $2.3M | $2.3M |
| 4 | SANTOS, LORENZO JUAN | DEM | $26K | $25K |