The California Democratic primary is up for grabs, as Hillary Clinton has watched her onetime 63-point lead in the polls shrink to six points over Sen. Bernie Sanders, according to a Field Poll released Friday. Clinton leads Sanders 47 percent to 41 percent among likely voters in the June 7 primary, with 12 percent undecided. Voters who do not state a party preference are allowed to vote in the Democratic primary, which is good news for Sanders, as unaffiliated voters in other states have been supportive. In California, nonpartisans support Sanders 49 percent to 39 percent for Clinton. The survey...