Hatch act basically prevents employees from campaigning on govt time...
http://www.osc.gov/hatchact.htm
http://www.osc.gov/hatchact.htm
"The Hatch Act restricts the political activity of executive branch employees of the federal government, District of Columbia government and some state and local employees who work in connection with federally funded programs. In 1993, Congress passed legislation that significantly amended the Hatch Act as it applies to federal and D.C. employees (5 U.S.C. §§ 7321-7326). (These amendments did not change the provisions that apply to state and local employees. 5 U.S.C. §§ 1501- 1508.) Under the amendments most federal and D.C. employees are now permitted to take an active part in political management and political campaigns. A small group of federal employees are subject to greater restrictions and continue to be prohibited from engaging in partisan political management and partisan political campaigns."