Obama was first willing to attend the Warren campaign forum with McCain and now choose Warren to invocate at the inauguration because Warren has said that Evangelicals should consider that social justice and environmental justice are just as important as right to life, homosexuality, and stem cells.
Social Justice voters are democratic voters.
Sadly when they read Jesus saying Feed my sheep they think it is a commandment to set up soup lines. And they do not care who gets required to pay for it.