GWEN IFILL: Among Democrats, Clinton holds the advantage among Latino voters because, supporter Dolores Huerta says, of the Clintons' history.
DOLORES HUERTA, Co-Founder, United Farm Workers: I think, in terms of the Latino community, we have a relationship with Hillary. We really trust her. She's not somebody who is new to our community. She's somebody that we know, somebody that's advocated for us. And this is -- I think that's why most of us are supporting her.
GWEN IFILL: Obama supporters agree Clinton does have an edge.
GILBERT CEDILLO (D), California State Senator: The Clinton legacy is powerful. It's huge. The Clinton campaign starts off with a great advantage, just the mere name identification. But where we're going to win, where we're going to make our gains is when people know the record and know the difference.
GWEN IFILL: Obama tried to even the playing field this weekend. New endorser Ted Kennedy, whose family has long ties to the farm workers union, which is backing Clinton this year, was dispatched to East Los Angeles.
SEN. EDWARD KENNEDY (D), Massachusetts: Un voto por Obama es un voto para la gente.
GWEN IFILL: In appealing to Latinos, Obama has emphasized his own father's immigrant roots.
SEN. BARACK OBAMA: With a father from Kenya, a mother from Kansas, and a story that could only happen in the United States of America.
GWEN IFILL: But immigration is not the only thing on the minds of the nation's largest minority. Like other Americans, most Latinos cite the economy, education, and the war in Iraq as their chief concerns.
ANTONIO GONZALEZ: Latinos fall in that side of the electorate that thinks about tomorrow, thinks about the future. Therefore, they are for activist government that is stimulating tomorrow's jobs. And they're for an activist fiscal policy that's for borrowing and investing. And we're even for higher taxes if the taxes are properly intended.
GWEN IFILL: Neither side is willing to predict Tuesday's outcome in such a volatile election year, so the competition for every available vote is heated. The candidates are competing for a slogan first coined by the farm workers union.
CROWD: Si, se puede! Si, se puede! Si, se puede!
GWEN IFILL: They are competing to mobilize a critical mass of voters with what both candidates say will be an unrivaled get-out-the-vote operation tomorrow. And they are also competing for the votes that could very likely tip a close election.
JIM LEHRER: You can ask questions about California's primary and other Super Tuesday contests in an Insider Forum on our Web site. To do so, just go to PBS.org.