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There are several Bay Area events planned around the Illinois senator’s birthday this weekend, including cleaning up Lake Merritt while wearing Obama gear.

“What do you get for the man who seems to truly have it all?” the invite asks. “How about the jewel of Oakland?”

Mrs. Clinton and Mr. Obama raised more than $8 million each in the Golden State, pulling in cash from Silicon Valley venture capitalists and Hollywood’s top stars. The former first lady has slightly more financial support in the state, but voters are split among those who think she is the most qualified candidate and others who worry she is not electable.

“This country is on a downward spiral, and I think Obama has a better chance of winning the general election,” said Chris Condit, an engineer in San Diego. “He’s much more sincere than Hillary. Plus, he’s a man.”

But Mrs. Clinton has the support of California blogger Steve Soto (www.theleftcoaster.com) for her willingness to fight.

“She and her team have already demonstrated that they will take no prisoners in dealing with the GOP, will hold the media accountable, and have the requisite toughness and yes, ruthlessness for what is ahead,” he wrote.

Feb. 5 is dubbed “Super-Duper Tuesday,” as California and New York lead a pack of states holding primaries.

It is possible a clear primary winner will not emerge in the four earliest contests — Iowa, Nevada, New Hampshire and South Carolina — and Californians will have a unique opportunity to shape history.

California Democrats allow independent voters to participate in their primary, and early absentee voting there means Californians can cast their ballots weeks before the primary, sooner than some in the “big four” states.

California also does not hold a “winner-take-all” primary, which means any candidate getting at least 15 percent of the votes will score some allocation of convention delegates.