Note: This episode contains strong language. Senator Bernie Sanders is a staunchly pro-union candidate. But he has found himself mired in an escalating battle over health care with the largest labor union in Nevada. With what some call “the best insurance in America” — the fruit of struggles including a six-year strike — members of the Culinary Workers Union have been reluctant to support Mr. Sanders’s “Medicare for All” plan. We went to Nevada to ask how what is effectively an anti-endorsement of Mr. Sanders from the union’s leaders may affect his support in the state’s caucuses on Saturday. Guests: Jennifer Medina, who is covering the 2020 presidential campaign for The Times traveled to Nevada with Clare Toeniskoetter and Austin Mitchell, producers for “The Daily.” For more information on today’s episode, visit nytimes.com/thedaily.  Background reading: Mr. Sanders, who is betting on the Latino vote to win the nomination, is trying to convince Nevada’s union members his policies are in their best interest. His rivals are trying to capitalize on the fight.The Nevada Democratic Party has been scrambling to put in effect safeguards in its caucuses to avoid the technical issues that created a debacle in Iowa. Here’s how the caucuses will work.