The Constitution stands for the dignity and unity of India and Indians, Prime Minister Narendra Modi told parliament today on the occasion of Constitution Day. Saluting Dr Bhim Rao Ambedkar, who played a key role in the framing of the document, the Prime Minister claimed that nobody would be happier at the state of affairs in the country than its first Law Minister. India had strengthened and empowered its democracy in the 70 years since the Constitution was adopted, he added.