One of the scariest things about this lunatic is that she has presidential aspirations.

LOS ANGELES — Massachusetts Sen. Elizabeth Warren and AFL-CIO President Richard Trumka denounced the United States Supreme Court on Sunday as a right-wing panel that serves the interests of corporate America, previewing a theme that is likely to rise in prominence with the approach of the 2016 election.

On the opening day of the AFL-CIO’s convention, Warren — the highest-profile national Democrat to address the gathering here — warned attendees of a “corporate capture of the federal courts.”

In a speech that voiced a range of widely held frustrations on the left, Warren assailed the court as an instrument of the wealthy that regularly sides with the U.S. Chamber of Commerce. She cited an academic study that called the current Supreme Court’s five conservative-leaning justices among the “top 10 most pro-corporate justices in half a century.”

Warren’s reception in Los Angeles also underscored her core appeal to the progressive base of the Democratic Party. Her entrance into the convention hall was greeted was effusive applause; Trumka hailed her as “an honest-to-God champion, the real deal” and a senator who stands up to “billion-dollar corporations and Wall Street on behalf of working people.”