MLK holiday offers stage for Democratic hopefuls

Following a Martin Luther King Jr. prayer service at Zion Baptist Church in Columbia, S.C., on Monday, Jan. 21, 2019, New Jersey Sen. Cory Booker, D-N.J., left, and Sen. Bernie Sanders, I-Vt., right walk with NAACP President Brenda Murphy during a march to the Statehouse. (AP Photo/Meg Kinnard)
Former Vice President Joe Biden, speaks during a breakfast gathering commemorating the Martin Luther King Day in Washington, Monday, Jan. 21, 2019. (AP Photo/Manuel Balce Ceneta)
Former New York City Mayor Michael Bloomberg, speaks during a breakfast gathering commemorating the Martin Luther King Day in Washington, Monday, Jan. 21, 2019. (AP Photo/Manuel Balce Ceneta)
Before a Martin Luther King Jr. prayer service at Zion Baptist Church in Columbia, S.C., Monday, January 21, 2019, Sen. Cory Booker, D-N.J., stops for a photo with an attendee. Booker and Vermont Sen. Bernie Sanders visited the state as they mull 2020 challenges to President Donald Trump. (AP Photo/Meg Kinnard)
Sen. Cory Booker, D-N.J., and Sen. Bernie Sanders, I-Vt., greet people before a Martin Luther King Jr. prayer service at Zion Baptist Church in Columbia, S.C., on Monday, Jan. 21, 2019, during visits the state as they mull 2020 challenges to President Donald Trump. (AP Photo/Meg Kinnard)
From left, former New York City Mayor Michael Bloomberg, Rev. Al Sharpton, former Vice President Joe Biden and Martin Luther King Jr III, are gathered during a commemoration of Martin Luther King Day in Washington, Monday, Jan. 21, 2019. (AP Photo/Manuel Balce Ceneta)

COLUMBIA, S.C. — As Americans commemorated Martin Luther King Jr., Democratic presidential hopefuls fanned out across the country to honor the civil rights leader and make themselves heard on the national stage.