<span style="color: #222222;">Vice President M. Venkaiah Naidu has paid his tributes to Pandit Deendayal Upadhyaya on his birth anniversary today.<br />''<br />''In a tweet, he said, Upadhyaya was a great leader and profound thinker whose philosophy of integral humanism and Antyodaya has been a source of inspiration for all.</span><br />