(CNN) - Meg Whitman has made gains and is now in a dead heat with Jerry Brown in this year's battle for California governor, according to a new survey.
A Field Poll of likely California voters released Wednesday morning indicates that Whitman leads Brown 46 to 43 percent in a hypothetical general election matchup. Whitman's 3 point advantage is within the survey's sampling error. Brown led Whitman by 10 points in a Field Poll from January.
Whitman is the billionaire former CEO of eBay, who also served as an adviser and surrogate in 2008 for Sen. John McCain's presidential campaign. Brown is California's attorney general and former two-term governor from 1975-1983.
Brown, who formally announced his candidacy earlier this month, is facing no serious opposition for the Democratic gubernatorial nomination.
Whitman, who jumped into the race last year, is battling state Insurance Commissioner Steve Poizner in the June Republican primary. The poll indicates Whitman leads Poizner 63 to 14 percent among likely GOP voters. Whitman's 49 point lead is up from a 28 point advantage in January.
California's current governor, Republican Arnold Schwarzenegger, is term-limited and prevented from running for re-election this year.
The Field Poll was conducted March 9-15, with 748 likely California voters questioned by telephone. The survey's overall sampling error is plus or minus 3.7 percentage points.
–CNN Deputy Political Director Paul Steinhauser contributed to this story