Los Angeles (CNN) - With three days to go until California's primary, a second straight survey indicates that former Hewlett Packard CEO Carly Fiorina is the front runner in the battle for the Republican Senate nomination.
According to a Field Poll released Saturday, 37 percent of likely GOP primary voters back Fiorina, with 22 percent supporting former Rep. Tom Campbell and 19 percent pulling for state Assemblyman Chuck DeVore, with one in five undecided.
Fiorina also held a 15 point advantage over Campbell in a USC/Los Angeles Times survey released a week ago.
Many polls conducted earlier this year indicated that Campbell was leading the battle for the Republican nomination. Although he's in third place, the most recent surveys suggest that DeVore, a favorite of the Tea Party movement, has doubled his support since March.
The winner will face off in November against three-term Democratic Sen. Barbara Boxer. Forty-two percent of those questioned in the Field Poll say Fiorina has the best chance of defeating Boxer in the general election, with 22 percent saying Campbell is the best candidate to beat Boxer, and 12 percent indicating DeVore would be the strongest GOP nominee to take on Boxer.
The Field Poll was conducted May 27-June 2, with 511 likely California Republican primary voters questioned by telephone. The survey's overall sampling error is plus or minus 4.5 percentage points.
Follow Paul Steinhauser on Twitter: @psteinhausercnn