As it happened: Biden reveals vice-presidential pick - BBC News
Kamala Harris is chosen as the Democratic vice-presidential candidate.
Obama and Biden pictured in 2005, when both men were still US senators Image caption: Obama and Biden pictured in 2005, when both men were still US senators

"Choosing a vice-president is the first important decision a president makes," says former President Barack Obama in a statement.

"Joe Biden nailed this decision. By choosing Senator Kamala Harris as America’s next vice-president, he’s underscored his own judgment and character," he says.

To remind you, Obama picked Biden to be his running mate in 2008 and Biden served under him for eight years as vice-president.

"I’ve known Senator Harris for a long time. She is more than prepared for the job," Obama continues.

"She’s spent her career defending our constitution and fighting for folks who need a fair shake. Her own life story is one that I and so many others can see ourselves in: a story that says that no matter where you come from, what you look like, how you worship, or who you love, there’s a place for you here."

He concludes: "This is a good day for our country. Now let’s go win this thing."