The opposition campaign to Measure 92 has raised over $20 million in fundraising; supporters have raised just over $8 million.
Drug use policies will remain the employer's decision if Measure 91 is passed.
The Democratic senator announced that he plans to vote for Measure 91, which would legalize recreational marijuana use for adults in Oregon.
The Republican gubernatorial candidate asked for a federal criminal investigation of Gov. John Kitzhaber and his fiancee, Cylvia Hayes.
Opponents and proponents of the measure to label genetically modified foods have raised a combined $17.5 million.