A major political face-off is brewing between the BJP and Congress over the Special Intensive Revision (SIR) of electoral rolls. BJP president Nitin Nabin is set to lead a 'Loktantra Bachao, Arajakta Hatao' padyatra in Delhi's Chandni Chowk on October 28, ahead of the Congress-led Opposition's November 1 rally at Ramlila Maidan.