Sen. Kamala Harris endorses Biden for president

Kamala Harris endorsed Joe Biden on Sunday and said she would "do everything in my power" to help elect him, becoming the latest dropout from the Democratic race for president to line up behind the former vice president in his battle with Bernie Sanders for the nomination.

Harris exit points to hurdles facing minority candidates

The California senator abruptly withdrew from the race on Tuesday after her once-promising campaign failed to coalesce around a message that would resonate with voters. And without clear support from voters, Harris couldn't raise the money needed to keep going.