This is interesting:

As reported in a March 29, 2008 story from the AllAfrica.com news service, in March 2008 Rick Warren attended a conference of Ugandan Anglican Bishops who were protesting the Church of England's tolerance for homosexuality. AllAfrica, reporting on his appearance, summarized Warren's quotes as homosexuality is not a natural way of life and thus not a human right, and directly quoted Warren as stating, "We shall not tolerate this aspect at all."

The key involvement of Martin Ssempa in the bill, a close ally of Warren's (who has now distanced himself), is already known. I didn't realize that another key mover of the bill is Rick Warren's own mentor and dissertation adviser:

To little notice, a charismatic network overseen by Warren's doctoral dissertation advisor, C. Peter Wagner, has played a major role in politically organizing and inspiring the Ugandan legislators who have spearheaded the anti-gay bill. Both Wagner and Warren have designed elaborate infrastructures for blurring the lines between church and state. Wagner describes his movement as the “New Apostolic Reformation” and openly espouses his goals of reorganizing and mobilizing the church to take Christian “dominion” over government and society. Warren’s movement is described as a “second reformation” in the form of his P.E.A.C.E. plan, but his goals of rapid “expansion of the kingdom” in Uganda and elsewhere closely parallel those of Wagner's.