How is Samson a witness for the Lord?

My choir is singing a spiritual called _Witness for my Lord_ which tells several stories of men who proclaimed God in some manner or other: * Methuselah who lived a long life. * Daniel who survived the lion's den in defiance of the king. * Nicodemus who visited Jesus in the dead of night and learned that he needed to be born again through public baptism. But one of the verses stands out to me: > You read in the Bible and you understand Samson was the strongest man. Samson went out at-a one time And he killed about a thousand of the Philistine. Delilah fooled Samson, this-a we know For the Holy Bible tells us so. She shaved off his head just as clean as your hand And his strength became the same as any natural man. (There are other variations of this verse, but all assert that Samson was a witness on the basis of Delilah defeating his strength through trickery.) How does the Samson story fit with the other examples and in what way is Samson a witness?