SACRAMENTO, Calif.—The Progressive Caucus of the California Democratic Party is threatening to withdraw endorsements for any assemblymembers who vote against the single-payer healthcare bill on Jan. 31, according to an email sent out by the party this week. “What we’ve made clear to our delegates is that if an assembly member is going to vote against the party’s values, and vote against what is endorsed by the California Labor Federation, and what is supported by the majority of Californians, then they don’t deserve endorsement because they don’t believe in the values of the California Democratic Party,” Progressive Caucus Chairman and California Democratic Party Executive Board Member Amar Shergill told The Epoch Times. Without endorsement from the party, Democrat lawmakers seeking reelection could have trouble securing financial backing. The preliminary endorsement process for the November election begins Feb. 5—a few days after the Monday deadline for the assembly to approve the …