The Aam Aadmi Party's plans for the Haryana Assembly election later this year, and a potential seat-share deal with the Congress before the general election in April/May, hit a roadblock Thursday after Ashok Tanwar, its Dalit face and head of its Campaign Committee, quit citing "ethical" differences.In a terse resignation letter addressed to AAP boss and Delhi Chief Minister Arvind Kejriwal, Mr Tanwar blamed "the current political scenario" and criticised his party's talks with the Congress."In view of the current political scenario and your alignment with the Indian National Congress, my ethics won't allow me to continue... therefore, kindly accept my resignation..." Mr Tanwar wrote.