Was Obama's Passport File an Inside Job By The Clinton Campaign?

Just one week ago, on March 13, Daniel Malloy reported in the Pittsburgh Post-Gazette:

At 1:46 p.m. yesterday the e-mail arrived in reporters' inboxes from Sen. Barack Obama's campaign: "Obama Receives Endorsement of Flag Officers from Army, Navy and Air Force."

It touted a news conference earlier in the day at which 10 high-ranking former military officers had announced their support of Mr. Obama, an attempt to show the senator's strength on national security issues.

Exactly 24 minutes later, Sen. Hillary Clinton's campaign returned the salvo with a missive of its own -- a list of 31 high-ranking former military officers who have pledged their support for Mrs. Clinton in the past. Two minutes after that, the campaign issued a memo with pointed questions for Mr. Obama on national security, including:

"As voters evaluate you as a potential Commander-in-Chief, do you think it's legitimate for people to be concerned that you have traveled to only one NATO country, on a brief stopover trip in 2005, and have never traveled to Latin America?"

Just another day in the e-mail crossfire.

How did the Clinton campaign know Barack Obama's travel history?