New Delhi: Former Prime Minister Manmohan Singh on Friday took oath as a Rajya Sabha member here. The oath was administered by Rajya Sabha Chairman M. Venkaiah Naidu. Congress President Sonia Gandhi and top Congress leaders including Rahul Gandhi, Ghulam Nabi Azad, Ahmed Patel and Anand Sharma were present during the oath-taking ceremony in the Chairman’s chamber. Rajasthan Chief Minister Ashok Gehlot was also present on the occasion. (IANS)