evidence: Harris made her first public remarks since the announcement at the White House Monday at an event honoring college athletes. She said she's "deeply, deeply grateful" to Mr. Biden for his "service to his nation" and called his legacy "unmatched in modern history." [...] President Biden has frequently relied on Vice President Kamala Harris to be the White House's voice of unflinching support for reproductive health rights. [...] Vice President Kamala Harris has emerged as a top contender to replace President Biden at the top of Democratic ticket following his historic decision to withdraw from the 2024 race for the White House.