Bernie Sanders

When Sen. Bernie Sanders (I-Vt.) joined the race for the Democratic presidential nomination in 2016, it took little time for him to turn the competition into a two-person race with Hillary Clinton. As he joins the field for 2020, the path ahead will be more complicated and the environment potentially less forgiving.

Vermont Sen. Bernie Sanders says he will run again for the Democratic nomination. In this extended conversation with "CBS This Morning" co-host John Dickerson, Sanders discusses taking another shot at the presidency and why he believes this campaign will succeed.

The battle over electing new Democratic Party officials has revealed the growing populist energy within the party.