If this is how elections are fought and won, no party would ever lose an election. Many of your arguments are flawed.
This election is between the UPA and NDA and not congress and left. So the average NDA voter will not have an impact
Assuming that the congress actually grabs seats from left in WB and Kerala, who will it have to depend on to form the next Govt??? Maya Memsahab....now that is quite an option
There are 100 urban seats of which Congress has about 25-30. Considering the anger towards reservations and the farmer waiver, let us see how many of these seats will the congress retain.