The story

Presumptive Democratic presidential nominee Barack Obama introduced Sen. Joe Biden to the nation as his running mate Saturday, telling supporters that he is "a leader who is ready to step in and be president."

"For months, I've searched for a leader to finish this journey alongside me and join me in making Washington work for the American people. I searched for a leader who understood the rising costs confronting working people and will always put their dreams first," Obama said.

"Today, I've come back to Springfield to tell you I've found that leader," he said.

The rally is the pair's first joint appearance since Obama announced that Biden, the senior U.S. senator from Delaware, would be his running mate on his Web site and in a text message to supporters early Saturday morning. Watch Obama introduce his running mate

Democrats hope that Biden's working-class roots and foreign policy experience will help Obama, who informed Biden of his decision Thursday. Read full article »

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