New Delhi, Apr 1 - With the recent ganging up of regional parties on common issues, the coming Presidential election appears set to go down to the wire unless the ruling UPA manages to evolve a consensus on the successor to incumbent Pratibha Patil. A 'give and take' formula on the Vice Presidential election that follows the Presidential poll is also not ruled out if a successful consensus is evolved on the nominee who will occupy the Rashtrapati Bhavan next.