SAN DIEGO -- With two weeks to go until "Tsunami Tuesday," the Feb. 5 primary, a large majority of voters say they are undecided.

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That's according to the California Field Poll, which shows Sen. Hillary Clinton in the driver's seat -- but having slowly lost ground to Barack Obama since last fall.

Over a six-day polling period that ended Sunday, Clinton finished first with 39 percent, Obama trailed with 27 percent and Edwards finished with 10 percent.

Obama has picked up eight points on Clinton since the August Field Poll. Clinton's support has dropped by 10 points and John Edwards' backing has held steady.

"They really do have what we call the 'Top-3 Tier' candidates. They're great candidates to choose from. So a lot of hard-core Democrats are having a very tough time on this," said John Dadian, political consultant.

But in another interesting development, 20 percent of voters said they are undecided. In fact, if "undecided" were an option, it would land in third place in the Field Poll, NBC 7/39 reported.

NBC 7/39 noticed a healthy turnout for Tuesday's registration deadline. There were plenty of people voting absentee and plenty of Democrats who said they were energized by their choices.

John Anderson, of Tierrasanta, said, "I think it's a good race. I think the issues need to be debated and talked about, and let everybody make up their own mind."

On the Republican side of the state's presidential primary, John McCain has finished first in all three of the polls taken in California this month, by margins of 7 to 15 percent.

It's not a promising situation for Rudy Guiliani who is behind the curve to McCain in his own home state of New York and in Florida, but he is getting some backing in the Golden State from former governor, senator and San Diego mayor, Pete Wilson.

On Tuesday, he made campaign stumps on Guiliani's behalf in Santa Barbara, San Jose, Oakland and Sacramento. He told reporters, he's not rattled at Giuliani's slow start.

"He's made a calculated risk. He's betting the chips in Florida," Wilson said. "I think that he will prove that it was a good bet. The really important thing is that people not simply follow the leader and the leader changes from one to another. So far, the primary contest has looked like the college football season."

He also said media-driven perceptions of the horse race so far don't reflect his candidate's potential for a strong finish down the stretch.