By Jon Ponder on 8/23/2008, 6:27am PT  

Guest blogged by Jon Ponder, Pensito Review.

The 3 a.m. call:

Sen. Barack Obama has selected Delaware Sen. Joe Biden as his running mate, according to his official Web site and a text message the campaign sent to supporters on Saturday.

"Barack has chosen Senator Joe Biden to be our VP nominee," the text message, sent at around 3 a.m. ET, said.

"Joe and I will appear for the first time as running mates this afternoon in Springfield, Illinois --- the same place this campaign began more than 19 months ago," Obama said in an e-mail sent to supporters Saturday morning.

"I'm excited about hitting the campaign trail with Joe, but the two of us can't do this alone," he wrote. " We need your help to keep building this movement for change."

Vice presidential candidates are often called on to be the aggressors in the campaign. A comment Biden made earlier this year may have resonated with Obama:

“I refuse to sit back like we did in 2000 and 2004. This administration is the worst administration in American foreign policy in modern history — maybe ever. The idea that they are competent to continue to conduct our foreign policy, to make us more secure and make Israel secure, is preposterous. ... Every single thing they’ve touched has been a near-disaster.”