Mumbai, April 8 -- The Congress has replaced its candidate for the Ramtek parliamentary constituency, Rashmi Barve, with her husband Shyamkumar Barve, as the former's caste certificate was invalidated during scrutiny. Shyamkumar Barve had been asked to file nomination papers as a dummy candidate as the party leadership had anticipated some mischief, said former chief minister Prithviraj Chavan....