Former President Barack Obama and first lady Michelle Obama are preparing to head an all-star cast of ex-administration officials and party elders helping Joe Biden win back the White House for Democrats, but one alumna may have a less vocal and visible role.

Hillary Clinton, a divisive figure among swing state voters and independents as opposed to die-hard Democrats still smarting from her unexpected loss to President Trump in 2016, has dipped in and out of 2020 primary politics. However, the party’s past nominee has yet to endorse Biden.