Four presidential candidates will be forced to take time off the campaign trail Tuesday. Senators Elizabeth Warren, Amy Klobuchar, Bernie Sanders and Michael Bennet will head to Washington to serve as jurors in the Senate impeachment trial against President Trump. CBS News 2020 campaign reporters Bo Erickson, Cara Korte, Zak Hudak and Lacrai Mitchell join CBSN for this edition of 2020 Daily Trail Markers. Source

This year when the Kansas City Chiefs and San Francisco 49ers take the field, many will be watching the sidelines instead — for Katie Sowers to make history. Source

Larry Sabato from the University of Virginia’s Center for Politics joins CBSN’s “Red and Blue” with a look at how President Trump’s impeachment trial may compare to ones in the past. Source

The shooting killed two people and wounded five others. Source

Senate gearing up for Trump’s impeachment trial; Continuing the fight for civil rights. Source

The impeachment trial of President Trump is set to begin. The president’s legal team is laying out its strategy. Ben Tracy reports. Source

In two weeks, the first votes in the Democratic race will be cast in Iowa, where tonight, there is no clear frontrunner. Ed O’Keefe reports. Source

Presindent Trump’s legal team issued a brief attacking the impeachment charges as “flimsy” a day before the Senate trial is set to begin. Reuters White House correspondent Jeff Mason, CBSN political contributor Molly Hooper, and CBS News legal analyst Kim Wehle spoke to CBSN’s “Red & Blue” about what to expect when the trial gets underway. Source

New research shows a link between marijuana and heart risks. At least 2 million adults with cardio-vascular disease have used marijuana. Dr. Tara Narula reports. Source

The threat of violence from white supremacist groups meant a heavy police presence in Richmond, Virginia, as thousands of gun rights supporters rallied on the Capitol grounds. Jeff Pegues reports. Source