The impeachment trial of President Trump begins in earnest, while the Iowa caucuses are less than two weeks away; with three of the top five presidential hopefuls locked in the Senate chamber hearing testimony, the Iowa race is too close to predict.

In the final week before the Iowa caucuses, Democratic hopefuls make their closing pitches; campaign leaders weigh in on their final sprints; even as his impeachment trial is underway in Washington, D.C., President Trump appears at an Iowa rally.

A fumbled Democratic Iowa caucus prevents the typical winnowing of candidates; the stakes of the New Hampshire Democratic primary go way up; President Trump delivers his State of the Union address and gets acquittals on both articles of impeachment.

The lead-up to the New Hampshire primary as well as the results and fallout; Sen. Bernie Sanders emerges as the frontrunner; former Mayor Pete Buttigieg and Sen. Amy Klobuchar make compelling cases for moderates; electability arguments solidify.

All eyes turn to Nevada and its Democratic caucus; Sen. Bernie Sanders (Ind.-Vt.) has the chance to cement his frontrunner status, while the others seek to challenge him; the DNC is on the ground in Nevada to make sure this caucus runs smoothly.

In the week of the South Carolina Democratic primary, with Super Tuesday closely following, voters are deciding if there is a viable challenger to Sen. Bernie Sanders; African American voters could bolster former Vice President Joe Biden's campaign.

The run up to the Democratic primaries on Super Tuesday and the aftermath of elections that turn the race upside down; experienced Democratic strategists wade through the repercussions.

Big Tuesday results cement former Vice President Joe Biden's frontrunner status, giving him a seemingly insurmountable lead in delegates over rival Sen. Bernie Sanders, who announces he isn't dropping out; the coronavirus pandemic affects the race.

The reaction to presumptive presidential nominee Joe Biden's monumental selection of Sen. Kamala Harris as his running mate; a behind-the-scenes look at the planning of a virtual Democratic National Convention.

A look at the Democratic Party's efforts to hold an unconventional convention, as well as the Trump campaign's attempts at counterprogramming; former Secretary of State Hillary Clinton discusses Joe Biden's long road ahead as the party's nominee.