Do you really think that is what Mr. Obama was doing? Seeking to further an agenda? I am far from an Obama supporter but all I saw in that clip and in the articles I read was a man patting some volunteers on the back for, in his view, helping less fortunate or poor people but telling them they were doing "God's work." And if poor people are being helped, it is what a professed Christian would consider the work of Christ, and by extension, the work of God.
I can just see Frank Drebbin standing there with a megaphone saying, "Move along! Nothing to see here! Please disperse! Keep moving!"