Former First Lady Michelle Obama privately has expressed frustration over how the Biden family largely exiled her close friend Kathleen Buhle after Buhle's messy divorce from Hunter Biden, two people familiar with the relationship told Axios.

Why it matters: The family tensions — and the former first lady's disdain for partisan politics — are partly why one of the Democrats' most popular voices hasn't campaigned for President Biden's re-election, the sources said, even as former President Obama has been a willing surrogate.