Endorser after endorser -- including former Presidentand Massachusetts Sen.this week -- has lauded Biden's ability to connect with what someone else is feeling and pointed to that characteristic as making him uniquely qualified to lead the country, particularly during a time of crisis like the

The focus on empathy and decency draws a not-so-subtle contrast with President Donald Trump , who has struggled to show compassion at times during his presidency.

Biden mentioned Trump's difficulties with empathy during a town hall on Wednesday.

"Have you heard him offer anything that approaches a sincere expression of empathy for the people who are hurting?" Biden asked. "Have we seen any sign that he grasps just how hard it will be for people to recover from this?"

Warren backed the former vice president on Wednesday by saying the "unspeakable tragedy" Biden has faced "animate the empathy he extends to Americans who are struggling -- no matter what their story."

"Empathy matters," Warren said. "And, in this moment of crisis, it's more important than ever that the next president restores Americans' faith in good, effective government. Joe Biden has spent nearly his entire life in public service. He knows that a government run with integrity, competence, and heart will save lives and save livelihoods."

Warren's praise echoed Obama, who said a day earlier that Biden has the "honesty and humility; empathy and grace" to lead the country.

"He's someone whose own life has taught him how to persevere; how to bounce back when you've been knocked down," Obama said. "When Joe talks to families who've lost a hero, we hear another parent of an American veteran; a kindred spirit; somebody whose faith has endured the hardest loss there is."