(CNN) - Massachusetts Rep. Stephen Lynch, a Democrat, obtained the necessary paperwork Friday to run for the Senate seat long held by the late Sen. Ted Kennedy, according the Massachusetts Secretary of State's office.
Lynch's move comes a day after Democrat Martha Coakley, the state's attorney general, officially kicked off her campaign for the seat. A primary election has been set for December 8 while the general election will be held on January 19.
Lynch, whose district includes Boston's southern suburbs, has served in Congress since 2001. Before that he spent close to a decade in the Massachusetts House and Senate.