I always thought he Was a Friend of Mine (Byrds version) referred to the Kennedy brothers and Martin Luther King - no?
as stated in the message above, Abraham, Martin and John certainly fits.
-Joe-

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Here's one from http://www.peterpaulandmary.com

NO EASY WALK TO FREEDOM
Peter Yarrow and Margery Tabankin
©1986 Silver Dawn Music (ASCAP)

Brother Martin was walkin with me,
And every step I heard liberty
Tho he's fallin', come a million behind!
Glory, Hallelujah, gonna make it this time!

chorus:
No easy walk to freedom,
No easy walk to freedom,
Keep on walkin and we shall be free
That's how we're gonna make history

Across the ocean, the blood's running warm
I, I hear it coming, there's a thunderin' storm
Just like we lived it, you know that it's true,
Nelson Mandela, now we're walkin with you!

(chorus)

In our land, not so long ago,
We lived the struggle, and that's how we know
Slavery abolished, comin' freedom's call
Keep on walking and apartheid will fall!

(chorus)

Oh, bread for the body, there's got to be
But a soul will die without liberty
Pray for the day when the struggle is past!
Freedom for all! Free at last! Free at last!

(chorus)

You and me!