(CNN) - A new poll indicates that the Democrats are opening up leads in the California battles for senator and governor.
According to a CNN/Time/Opinion Research Corporation poll released Wednesday, 52 percent of likely voters in the Golden State say they support Democratic Sen. Barbara Boxer, with 43 percent backing Republican challenger Carly Fiorina.
A USC/Los Angeles Times poll released over the past week put the three-term senator's lead at eight points, with a California Field Poll giving Boxer a six-point edge.
Among a larger sampling of registered voters, the CNN/Time survey indicates that Boxer leads Fiorina by 19 points, 56 to 37 percent. Boxer's share of the vote among registered voters is up eight percentage points since the beginning of the month.
According to the poll, Fiorina holds a 14-point advantage among independents likely to vote in the general election.
"But Boxer has been able to counter that deficit with big gains among California women, particularly college-educated women," CNN Polling Director Keating Holland said.
"Boxer's support among men remained virtually unchanged, but among all female voters, she has picked up 14 points since early September."
Fiorina, the former Hewlett Packard CEO, earlier this year won a three-way battle for the state's GOP Senate nomination.
In the fight for governor, the poll indicates that 52 percent of likely voters back California Attorney General and former Gov. Jerry Brown, the Democratic nominee, with 43 percent supporting former eBay CEO Meg Whitman, the GOP nominee.
The USC/Los Angeles Times survey taken last week indicated Brown held a five-point advantage over Whitman, with the Field Poll done at the same time showing the candidates tied at 41 percent.
According to the CNN/Time poll, Brown leads Whitman 52 to 39 percent among a larger sampling of registered voters. Brown's 13-point advantage is up from a two-point deficit in the early September survey.
"Virtually all of Brown's additional support comes from voters who attended college," Holland noted. "That helps to neutralize the 13-point advantage among independents that Whitman currently has."
The winner in November will follow moderate Republican Gov. Arnold Schwarzenegger, who is term limited.
The CNN/Time/Opinion Research Corporation poll was conducted September 24-28, with 1,507 adults, including 1,325 registered voters in California and 786 likely voters, questioned by telephone.
The survey's sampling error is plus or minus 2.5 percentage points for registered voters and plus or minus 3.5 percentage points for likely voters.
- CNN Deputy Political Director Paul Steinhauser contributed to this report