One of the greatest semi-Wesleyan scholars (who actually made his living as a Baptist preacher/social activist) is an essential to the continual spiritual formation of any strong Methodist. Martin Luther King; made his ministry from the social gospel, transferring Biblical stories into modern day prophecies and teachings that transformed the 1960s and made the modern world as we know it (of course, there is always some question as to whether it has really taken effect in some cities like Birmingham, New Orleans, etc.).
Of course, you have to love his rousing words from the Washington National Mall, or even his letter from the Birmingham jail. But, this is pure MLK, from his sermons pre-movement, but they continued throughout his life, even to his assassination, in which he became a martyr for the same social gospel he believed:
We must love the unlovable. Love the hell out of them.
-Reverend Dr. Martin Luther King, Jr.