Health Care: In 2017, Sanders introduced a bill to transition to Medicare for All, a system where every American would get health care through the government. The proposal is seen as one test of liberal credentials: Democratic presidential candidates Sen. Kamala Harris of California, Sen. Kirsten Gillibrand of New York, Sen. Cory Booker of New Jersey and Sen. Elizabeth Warren of Massachusetts all endorsed his legislation. Critics have called his plan too radical or expensive. The Vermont senator has also joined Democratic leaders in introducing legislation to slash drug costs, in part by encouraging imports of cheaper drugs from abroad and giving Medicare more power to negotiate prices.

Labor: Sanders has pushed for a $15 per hour minimum wage and urged major companies to give their workers raises. He introduced Senate legislation to hike the federal wage floor in January, calling the current $7.25 an hour a “starvation wage.” Booker, Gillibrand, Harris, Sen. Amy Klobuchar of Minnesota and Warren are all co-sponsors. Last year, his pressure on Amazon contributed to the internet retailer raising its minimum wage to $15 per hour. He has pushed other companies, from Walmart to McDonald’s, to take the same step. Numerous businesses have argued a $15 wage floor would force them to reduce hours or cut jobs. Sanders also has pushed to boost dwindling private sector labor unions.

Taxes: The Vermont senator has slammed the Republican tax plan passed in December 2017, calling it an unnecessary boon to corporations and the wealthy. To address growing wealth inequality, Sanders wants to expand the estate tax. A plan proposed in January would tax estates starting at $3.5 million, with a 77 percent rate on billionaire estates. Various 2020 Democratic candidates have unveiled proposals to either tax the wealthy more or reduce the tax burden on the middle class.

Investing/Banks: Sanders has pointedly criticized Wall Street for years. In October, he introduced a bill to cap the size of financial institutions, which would break up banks including J.P. Morgan Chase and Goldman Sachs. Earlier this month, he unveiled a plan to restrict stock repurchases, which would put conditions on share buybacks. Senate Minority Leader Chuck Schumer, D-N.Y., endorsed it alongside Sanders in another sign of the Democratic Party’s shift.

Education: In 2017, Sanders introduced a plan to make community college tuition-free and eliminate tuition at four-year universities for students from families with income of $125,000 or less. He has also pushed for more student loan forgiveness.

Climate Change: The senator has endorsed a version of the Green New Deal, a plan to dramatically reshape the U.S. economy to cut carbon emissions and address climate change. Other 2020 Democratic contenders have endorsed that plan in some form, though not necessarily as outlined by Rep. Alexandria Ocasio-Cortez, D-N.Y. President Donald Trump and Republican campaign groups have also seized on the freshman representative’s proposal as evidence of a Democratic Party drifting toward socialism.