IRVINE, Calif. — The proxy fight between liberals and establishment Democrats flared up during a debate in southern California, days ahead of the state’s Tuesday primary.

Democrats running to take on Republican incumbent Mimi Walters in the 45th District, which stretches east from Irvine to North Tustin and Lake Forest, met for the final time this week to present their vision to voters. Through forced smiles, the candidates started the debate in a high school gymnasium cordially. But by the end, progressive Katie Porter didn’t hold back, taking jabs at the more moderate Dave Min for not heartedly backing Medicare for all.