[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/07/28/art.obamavp.ap.jpg caption="Obama headed into the office building of VP vetter Monday."]
(CNN) - In a sign Barack Obama may be moving closer to selecting a running mate, the Democratic presidential candidate was spotted Monday heading into the Washington office building of his top VP vetter, Eric Holder
Following a roundtable with some of his top economic advisors, Obama headed to the downtown Washington law offices of Covington and Burling, where Holder is a partner. He declined to answer any questions on his way in.
CNN Political Market: Who will Obama choose?
Holder, along with Caroline Kennedy, is principally in charge of steering the Illinois senator's search for a No. 2. Longtime Washington insider Jim Johnson had also been leading the search but stepped down last month amid questions over favorable loans from Countrywide Financial.
Caroline Kennedy is also reportedly in Washington Monday for a Democratic National Committee fundraising event.
Obama's campaign wouldn't comment on the meeting, though he's expected to spend nearly two hours there before heading to a fundraiser in Arlington. Obama campaign manager David Plouffe, as well as senior advisers David Axelrod and Robert Gibbs, are also traveling with Obama Monday, though it is unclear if they are attending the meeting.
Speaking with NBC Sunday, Obama wouldn't say how close he is to selecting his running mate, but said it would happen "soon enough."
“I'm going to want somebody with integrity. I'm going to want somebody with independence, who's willing to tell me where he thinks or she thinks I'm wrong, and I'm - I'm going to want somebody who shares a vision of the country where we need to go, that we've got to fundamentally change not only our policies, but how our politics works, how business is done in Washington,” he said.
UPDATE: Obama left Holder's office building shortly before 7 p.m. ET, almost three hours after he went in. He declined to answer any questions on who he met with.