Sanders has lead in California, up 10 points since the November survey.

https://www.ppic.org/press-release/sanders-biden-and-warren-lead-in-californias-primary/

Among likely voters in California’s March 3 Democratic primary, Sanders is the choice of 27 percent, while 24 percent favor Biden and 23 percent favor Warren. They are followed by Pete Buttigieg (6%), Amy Klobuchar (4%), and Andrew Yang (3%), while 7 percent don’t know. (Note: We included the five candidates who qualified for any upcoming Democratic National Committee debate before the beginning of our interview process and respondents could name someone else. Survey respondents who indicated Yang as their choice volunteered their answer; 1 percent mentioned Mike Bloomberg.)

This latest PPIC survey shows Sanders up by 10 percentage points since PPIC’s November survey (27% vs. 17%), while Biden’s and Warren’s numbers are identical to two months ago.

Candidate preference varies by age group. Among younger voters (age 18–44), Sanders (45%) has much more support than Warren (25%) and Biden (12%), while voters age 45 and older favor Biden (32%) over Warren (22%) and Sanders (15%). Asked who they think has the best chance of defeating Donald Trump, 46 percent of Democratic primary likely voters say Biden, far more than say Sanders (25%) or Warren (10%). Among younger voters, 39 percent say Sanders (31% Biden, 11% Warren). Among older voters, 56 percent say Biden (16% Sanders, 9% Warren).