Elizabeth Warren has portrayed herself as a champion of the working class and has argued that “billionaires and big corporations” have rigged the political and economic system to their advantage. “In our country, if you work hard and play by the rules, you ought to be able to take care of yourself and the people you love,” she said in her announcement video.

Accomplishments: A former Harvard law professor, Warren spent much of her career researching consumer bankruptcy, and her work was instrumental to the creation of the U.S. Consumer Financial Protection Bureau.

Foreign policy: She voted in favor of President Donald Trump’s decision to pull U.S. troops out of Syria and Afghanistan, and against allowing state and municipal governments to punish companies that boycott, divest from or place sanctions on Israel to protest that country’s treatment of Palestinians.

What sets her apart: Warren gained a name for herself by taking on bankers and large companies and has used her position on the Senate Committee on Banking, Housing and Urban Affairs to grill Wall Street executives. Warren has said she is of Native American heritage, a claim that has been mocked by President Donald Trump. She recently apologized to the Cherokee Nation for taking a DNA test to prove her claims of Native American ancestry, and said she was sorry that she identified herself as a Native American for almost two decades.

Platform: A tax on the ultrawealthy, including a 2 percent annual wealth tax on Americans with assets greater than $50 million and a 3 percent wealth tax for billionaires; a single-payer health care system known as “Medicare-for-All,” and a mandate that 40 percent of corporate board of directors are selected by company employees.