In his remarks at the construction site in Virginia, President Obama said he understood those who charge that the stimulus plan "is too big to be implemented effectively and efficiently."
"The fact is, there's a certain amount of skepticism, much of it justified, by what we're accustomed to seeing in Washington," he said but insisted he's confident "that we can do things differently and better."
He announced plans to appoint an oversight board to monitor the spending in the stimulus package "as part of an unprecedented effort to root out waste and inefficiency."
He vowed that the federal government would be held to "new standards of accountability."
Mark Knoller is a CBS News White House correspondent.