What was Martin Luther King, Jr.'s understanding of salvation?

I've been reading *A Testament of Hope*, which is a compilation of sermons by the Rev. Martin Luther King, Jr. I also know he's a Baptist. (I even got to stand and preach for a minute in his pulpit last year!) What I haven't seen in these sermons is an emphasis on the Gospel, but I'm not sure if that was a selection bias (since the book really is there to *focus* on his Social Gospel), or if that really is indicative of his preaching style. Is there a good sermon that represents his view of salvation? (An altar call? A good theology? Bueller, Bueller!)