Hectic speculation in Tamil Nadu political circles is why have DMK leaders not received Pranab Mukherjee at Chennai airport nor accept the invitation from Governor K Rosaiah for lunch hosted at the Raj Bhavan during Pranab's visit to Chennai. Neither did DMDK's Vijayakant. Does this send a signal for a future political alliance in Tamil Nadu -- a DMK-Vijayakant-Left parties alliance that will  leave Congress in a lurch?