They said such federal agencies could include the Department of Defense and the General Services Administration (GSA), which manages government buildings.
"The proximity of Washington, DC to the mid-Atlantic’s wind resources... creates an exceptional opportunity," the governors wrote.
"This [proposal] would create the economies of scale necessary to significantly reduce the cost of offshore wind development, attract manufacturers of offshore wind equipment and installation vessels, and develop high-paying green jobs for our workers," they added.
Maryland has already offered a long-term contract to buy 55 MW of offshore wind, the letter said.
Bluewater, the most advanced proposal for a wind farm off the Delaware coast, has a 25-year PPA with Delmarva Power & Light for 200MW of its proposed 450MW.
The governors, both Democrats, also asked Obama to support legislation allowing the GSA to enter into PPAs of longer than ten years.