Democratic 2020 hopefuls march in Selma; Sanders campaigns in California

Fresh off a victory in South Carolina propelled by black voters, former Vice President Joe Biden on Sunday commemorated the "Bloody Sunday" march in Selma, Alabama, where he laid a wreath at the bottom of the Edmund Pettus bridge and spoke with Reverend Al Sharpton.

At the nearby Brown Chapel AME Church, former New York City Mayor Mike Bloomberg received a chilly reception at the historic African-American church, where some in the pews stood and turned their backs on him as he spoke.

Bloomberg has made a concerted effort to reach out to black voters, including apologies for overseeing an increase in the use of the "stop and frisk" police practice, which disproportionately affected minorities.

Alabama is one of the 14 states holding nominating contests on Super Tuesday, the biggest day of voting in the Democratic race.

Other candidates were in Selma to commemorate the landmark civil rights march, including senators Elizabeth Warren and Amy Klobuchar and even billionaire Tom Steyer, who dropped out of the race after finishing third in South Carolina on Saturday.

Meanwhile, the man who came in second in that primary, front-runner Bernie Sanders, was campaigning in California, the biggest prize of this week's Super Tuesday contests.

Sanders leads opinion polls in California, where 3 million early votes have already been cast.

Earlier on Sunday, Sanders attacked Biden for taking contributions from Super PACs and billionaires, courting wealthy donors at what he said was the expense of working-class people.

Sanders leads in the overall national delegate count with 56 and Biden is in second with 51.

A candidate will need at least 1,991 delegates to win the nomination outright at the party’s convention in July, before HE OR SHE can take on President Donald Trump in November.