The Aam Aadmi Party will not only contest all the Lok Sabha seats in Delhi but will also take on the Congress, whose support is crucial to its government in the Capital, in neighbouring Haryana and Maharashtra in assembly elections.  A day after it announced its plan to go national, AAP on Sunday said a nation-wide 14-day enrolment drive -- Main Bhi Aam Aadmi -- will open on January 10 even as it ruled out contesting all the 543 Lok Sabha seats.