Nation on Wednesday remembered Mahatma Gandhi -- the Father of the Nation- on the occasion of his 144th birth anniversary with top leaders paying floral tributes at his memorial - Rajghat. President Pranab Mukherjee, Vice President Hamid Ansari, Prime Minister Manmohan Singh, Congress president Sonia Gandhi were among prominent leaders who paid homage to Father of the Nation. The Congress President was the first to arrive at Rajghat to pay tributes to Mahatma Gandhi.