Democratic presidential candidate Hillary Clinton’s once-daunting lead in California has evaporated, with rival candidate Bernie Sanders closing to within 6 percentage points of the former secretary of state, a new Field Poll revealed Friday.

The nonpartisan poll of likely voters in California’s June 7 primary showed Clinton leading Sanders 47 percent to 41 percent. In February 2015, Clinton led the Vermont senator 73 percent to 10 percent.

The narrower gap reflects the momentum Sanders, a self-described democratic socialist, has carried in the race for the Democratic presidential nomination.

Sanders has won six straight states heading into New York’s primary on April 19.

Despite his winning streak, Sanders still trails Clinton in the race for the 2,383 delegates needed to secure the nomination. As of Friday, Clinton had a 250-delegate lead over Sanders in terms of pledged delegates. When superdelegates – those free to vote for the candidate of their choice – are factored in, Clinton’s lead grows to 688 delegates.

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Many political observers expect Clinton will be the nominee, noting that Sanders has to win big in states with large delegate contingents such as California to have a chance of overtaking Clinton.

The Field Poll found disparities in the support base for Clinton and Sanders. Sanders dominates among voters 18 to 29, while Clinton is preferred 3-to-1 by voters 65 and older, the poll reported.

There’s also a difference among registered Democrats and independent voters, who are allowed to vote in California’s Democratic primary. Clinton holds an 11-percentage point lead among Democratic voters, while Sanders has a 10-percentage point lead with independents.

Clinton leads by 17 percentage points among women, while Sanders leads among male voters by eight percentage points.

Latino voters are now more closely divided between Clinton and Sanders, the poll found. Forty-nine percent of Latinos back Clinton, while 42 percent support Sanders. In January, Clinton led Sanders among Latinos 53 percent to 35 percent.

There’s also a divide along income lines. Clinton leads by 12 percentage points in households with $100,000 or more in income, but she only leads Sanders 46 percent to 45 percent in households earning less than $100,000.

The telephone poll of 1,400 registered voters, including 584 likely voters, took place between March 24 and April 4.

It has a margin of error or plus or minus 3.5 to 4 percentage points.

Contact the writer: 951-368-9547 or jhorseman@pe.com