Appearing on "Good Morning America" today, Obama senior adviser Robert Gibbs touted Biden's foreign policy experience and potential appeal among working class voters.
"We've got someone who hasn't forgotten where he's from, who goes home to Delaware every night on the train, has a working class background from Scranton," Gibbs told ABC News' Kate Snow. "[Biden] has a record of reaching across party lines to get things done not only in foreign affairs -- where he's an undisputed expert -- but somebody who's working to strengthen crime laws in the country, prevent violence against women, and work with Sen. Obama to strengthen fuel efficiency standards in the Congress."
Asked if Biden's extensive Washington experience highlights holes in Obama's own resume, Gibbs disagreed, saying the ticket-mates complement each other.
"I think we've got a great partnership of foreign and domestic policy to keep our country safe and get our economy moving again," Gibbs said. "We think we've got a great pick. ... We've got someone who's ready to partner with Barack Obama to bring change to this country."
While speculation about the veep choice whipped into a fever pitch this week, the frontruners kept mum. Biden, along with Sen. Evan Bayh, D-Ind., and Virginia Gov. Tim Kaine, all received calls about Obama's pick on Thursday, ABCNews has learned.
"Look, we're pretty good at keeping secrets and we pride our campaign on that," Gibbs said. "But what we're not afraid to do today is to talk about our nominee for vice president."
The McCain campaign wasted little time in hitting Obama's new vice presidential candidate, releasing a new 30-second ad with video of Biden criticizing Obama during a Democratic primary debate.
"I think he can be ready, but right now I don't think he is," Biden told ABC News debate moderator George Stephanopoulos in 2007. "The presidency is not something that lends itself to on-the-job training."
But despite the drama of the early morning text message and the quick McCain attack, ABC's polling director Gary Langer saw little measurable impact in either direction coming from Obama's vice presidential pick.
"As with previous vice presidential picks, Biden looks likely to have little if any direct effect on vote preferences," Langer wrote this morning. "In a new ABC News/Washington Post poll completed [Friday] night, 13 percent of registered voters said having Biden on the ticket would make them more likely to support Obama, while about as many, 10 percent, said it would make them less likely to do so. Most by far -- 75 percent -- said it would make no difference in their choice."
Though Delaware is among the smallest states in the country and its three electoral votes are reliably Democratic, Biden brings vast national political experience to the table.
Biden has cast more than 12,500 votes during his long political career. His significant Washington experience fills in a gap in Obama's resume, and yet is something that could work against Obama's outside-the-beltway style campaign.
And, as anyone who has covered Biden can attest, the senator likes to talk. That could be his greatest asset and his greatest liability as the number two on the Democratic ticket.