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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

Go deeper

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Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Health: Hospital crisis deepens as holiday season nears.
  2. Vaccine: Moderna to file for FDA emergency use authorizationVaccinating rural America won't be easy — Being last in the vaccine queue is young people's next big COVID test.
  3. Politics: Bipartisan group of senators seeks stimulus dealChuck Grassley returns to Senate after recovering from COVID-19.
  4. States: Cuomo orders emergency hospital protocols as COVID capacity dwindles.
  5. Economy: Wall Street wonders how bad economy has to get for Congress to act.
  6. 🎧 Podcast: The state of play of the top vaccines.
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First blood test to help diagnose Alzheimer's goes public

Photo: Jerry Naunheim Jr./C2N Diagnostics via AP

A non-COVID medical breakthrough: People over 60 now have access to a blood test for Alzheimer's disease.

Why it matters: The existing PET brain scan test costs some people about $5,000 and often isn't covered by insurance, AP reports.

Updated 2 hours ago - Politics & Policy

Wisconsin, Arizona certify Biden's victories

Photo: Demetrius Freeman/The Washington Post via Getty Images

Arizona and Wisconsin officials confirmed the presidential election results in their states, formalizing President-elect Joe Biden's victories in the key battlegrounds.

Why it matters: The moves deal yet another blow to President Trump's efforts to block or delay certification in key swing states that he lost.