"Baba Ramdev and Anna Hazare had and will continue to have the support of the Sangh Parivar. Even during elections these people have been supportive of them (Sangh)," Singh told reporters.
Singh's remarks came on a day yoga guru Ramdev and Gujarat Chief Minister Narendra Modi shared the dais at a function in Ahmedabad.
On Hazare joining the fast from today, the Congress leader said "poor Anna will be forced to sit on fast, if Arvind Kejriwal and others from Team Anna cannot fast."
Team Anna had on Wednesday launched an indefinite fast here demanding passage of the Janlokpal Bill by Parliament and action against "corrupt" ministers.
While Team Anna members had begun the fast on Wednesday, Hazare joined them in fasting from today.