And independent Senator Bernie Sanders has formally kicked off his campaign for the Democratic presidential nomination. Addressing a rally in his home state of Vermont, Sanders vowed to tackle income inequality and the political power of the 1 percent.

Senator Bernie Sanders: “I am proud to announce my candidacy for president of the United States of America. Today, with your support and the support of millions of people throughout our country, we begin a political revolution to transform our country economically, politically, socially and environmentally. Today, we stand here and say loudly and clearly: Enough is enough. This great nation and its government belong to all of the people and not to a handful of billionaires.”

Sanders is the only challenger to Democratic frontrunner Hillary Clinton so far, but former Maryland Governor Martin O’Malley could declare later this week.