The Proposition 30 campaign has collected almost $6.3 million
and has more than $5 million cash on hand.
The November ballot measure would raise income taxes on
California's highest earners and raise the state sales tax a
quarter of a cent.
Donors giving $100,000 or more include the California Faculty
Association, California Association of Hospitals and Health
Systems, and a California School Employees Association political
action committee.
In addition, Brown reported raising more than 800-thousand
dollars so far this year for his 2014 re-election bid.
He now has more than $6 million cash on hand. The third-term
governor has not yet said if he will run for re-election.