He's actually a Baptist. A one of a kind Baptist if there ever was one.
He’s a member of the American Baptist church, not at all to be confused with the Southern Baptists for example. The AB have been moving to the left since the 1970s, have a significant number of black congregations, and are a member of the National Council of Churches. Such an article is not at all surprising coming from that background.
BTW, I’ve heard similar arguments from a number of pastors here in Alabama. Usually pastors of inner city black congregations. Some have almost claimed that it is a sin not to vote for tax increases. (On the rich of course.)