The couple, who just hours before attended the Republic Day parade, were the centre of attention as they waved, smiled and shook hands with the other guests at the high tea.
With security restrictions in place, the US President and his wife Michelle settled in the VVIP enclosure, which had been expanded this time to include cabinet ministers and senior BJP leaders including its President Amit Shah and L K Advani.
Mukherjee, Obama and Prime Minister Narendra Modi, who was dressed in a red coloured jacket with a cream coloured shawl, went around meeting VVIPs in the enclosure.
On the platter were 'chicken Malai tika', cheese cucumber sandwiches, 'Aloo-matar ke samose', 'Paneer wrap', 'Anar bhog' and fruit slice for the guests.
Over 2,000 people had gathered in the lawns on the occasion. Obama stayed within the VIIP and settled in his seat after meeting the three services Chiefs and 95-year-old Marshal of the Indian Air Force Arjan Singh, with whom he spent a couple of minutes.
This time, because of the security arrangements, pathways were already demarcated to allow the two Presidents and Modi to meet the public. On earlier occasions, Mukherjee used to keep his security at length and freely mingle with the people who had gathered at the function.
Today, while Mukherjee and Modi were meeting people, Vice President Hamid Ansari and his wife Salma were giving company to Michelle and the US President respectively.
Gursharan Kaur, wife of former Prime Minister Manmohan Singh, had arrived at the venue earlier while her husband followed with Congress President Sonia Gandhi.
The Congres chief and Singh had earlier called on Obama.
Advani, who had come with his daughter Pratibha, mostly kept to himself during the entire stretch of the function.
Besides politicians, diplomats from various countries were invited at the event.
