Congressional Hispanic Caucus chair unseated by socialist challenger

Congressional Hispanic Caucus chair Adriano Espaillat (D-N.Y.) lost his primary Tuesday to democratic socialist challenger Darializa Avila Chevalier, the Associated Press projects.

Why it matters: It's a major blow to the Democratic Party establishment and underscores the liberal grassroots' growing frustration with party leaders.

• The race attracted national media attention and millions in outside spending in favor of both candidates.

By the numbers: BOLD America, which received cash from both the Congressional Hispanic Caucus' super PAC and AIPAC's United Democracy Project, was the biggest spender in the race, putting $2.9 million into defending Espaillat, according to Federal Election Commission filings.

• CHC's BOLD PAC spent an additional $230,000, with Latino Victory Fund spending $750,000. Several other groups spent big in support of Epsaillat, including Progressive Unity Fund, Project 218 and United for Progress.
• The left-wing Justice Democrats put $1.5 million into supporting Avila Chevalier, with American Priorities — a super PAC founded to counter AIPAC — spending another $1.3 million.