THE DEMOCRATIC NOMINEE…. It’s official.

Barack Obama, claiming a prize never held by a black American, swept to the Democratic presidential nomination on Wednesday as thousands of national convention delegates stood and cheered his improbable triumph.

Former rival Hillary Rodham Clinton asked the convention delegates to make it unanimous “in the spirit of unity, with the goal of victory.” And they did, with a roar.

Competing chants of “Obama” and “Yes we can” floated up from the convention floor as Obama’s victory was sealed. […]

Clinton’s call for Obama to be approved by acclamation — midway through the traditional roll call of the states — was the culmination of a painstaking agreement worked out between the two camps to present a unified front.

The band played “Love Train” as the delegates celebrated.

[Updated with video via TPM.]

Steve Benen

Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.