"The Revisionaries," a documentary about textbook standard-setting in Texas, recently debuted at the Tribeca Film Festival, and key subject Don McLeroy talked to Stephen Colbert Monday about the state's textbook debate.

McLeroy, former chair of the Texas Board of Education, is a dentist whose predominant classroom teaching experience is in Sunday School. During his two-year tenure for the state, the board examined guidelines for its science textbooks, considering revisions to standards that would encourage public schools to scrutinize "all sides" of scientific theory.

"When it gets to those good old evolutionists, they would have us believe so much that needs to be explained by unguided natural processes," McLeroy told Colbert Monday.