Dr. Martin Luther King, Jr.'s son, Martin Luther King III, his wife, Arndrea Waters King, and their daughter Yolanda Renee King visit the Martin Luther King Jr. Memorial on Martin Luther King Jr. Day on Monday. Photo: Sarah Silbiger/Getty Images

Democratic presidential candidates set aside their differences ahead of next month's Iowa caucus to march arm-in-arm in honor of the Rev. Martin Luther King Jr. Monday.

The big picture: Sens. Bernie Sanders and Elizabeth Warren clashed at last week's Democratic debate in Iowa. But in South Carolina, they linked arms and joined other candidates in singing "We Shall Overcome," the New York Times reports. In Washington, D.C., members of King's family and President Trump were among those commemorating the civil rights icon on Martin Luther King Jr. Day at his memorial.

Vice President Mike Pence and President Trump made a surprise visit to King's memorial. Photo: Nicholas Kamm/AFP via Getty Images
Sen. Cory Booker, South Carolina NAACP chapter president Brenda Murphy and Sen. Bernie Sanders march to the Statehouse to commemorate King. Photo: Sean Rayford/Getty Images
A marching band performs during the Martin Luther King Jr. Day parade in Washington, D.C. Photo: Yasin Ozturk/Anadolu Agency via Getty Images
Students from Benedict College line up for a march during the annual Martin Luther King Jr. Day at the Dome event in Columbia. Photo: Sean Rayford/Getty Images
Some people brought signs quoting King at the parade in Washington, D.C. Photo: Yasin Ozturk/Anadolu Agency via Getty Images

Go deeper: Why the MLK anniversary matters in every city

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Two officers shot in Louisville amid Breonna Taylor protests

Police officers stand guard during a protest in Louisville, Kentucky. Photo: Ben Hendren/Anadolu Agency via Getty Images

Louisville Metro Police Department said two officers were shot downtown in the Kentucky city late Wednesday, just hours after a grand jury announced an indictment in the Breonna Taylor case.

Driving the news: Metrosafe, the city's emergency services, said it received reports of a shooting at South Brook St. and Broadway Ave., near the area where protests were taking place. A police spokesperson told a press briefing the injuries of both officers were not life-threatening. One officer was "alert and stable" and the other was undergoing surgery, he said.

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Biden: Breonna Taylor indictment "does not answer" call for justice

Former Vice President Joe Biden. Photo: Leigh Vogel/Getty Images

Former Vice President Joe Biden on Wednesday condemned the grand jury indictment of a Louisville police officer who entered Breonna Taylor's home in March in a botched drug raid that led to her death, saying in a statement the decision "does not answer" for equal justice.

The big picture: Biden called for reforms to address police use of force and no-knock warrants, while demanding a ban on chokeholds. He added that people "have a right to peacefully protest, but violence is never acceptable."

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