As a plaintiffs lawyer, Shannon Liss-Riordan has taken on Starbucks, Harvard University, American Airlines and most prominently, Uber. She is derided by corporations and lauded by workers for her employment practice. And she is hoping that her reputation as a fighter can translate into a Democratic primary upset in Massachusetts, where she’s running to unseat Ed Markey in 2020.

Liss-Riordan, a partner in the Boston firm Lichten & Liss-Riordan, announced her entry into the  senate race Monday, complete with local media interviews, campaign site and email blast to supporters.