District of Columbia Hatch Act Reform Act of 2007 - Amends federal law commonly referred to as the "Hatch Act" (concerning political activities of public employees) to: (1) include the District of Columbia within the definition of "state" with respect to political activities concerning certain state and local employees; and (2) remove provisions specifically applicable to employees of government of the District of Columbia. Makes such amendments effective on the date a law is enacted by the District of Columbia that places restrictions on political activities of employees of the District of Columbia government.