Matt Lewis at The Daily Caller:

Add the National Organization for Marriage (NOM) to the growing list of socially conservative organizations pressuring Herman Cain to clarify his support for their issue by signing a pledge.

In a blog post, NOM’s president praised Cain, saying his “position on marriage is moving in the right direction.” But he also noted that Cain’s “piecemeal and evolving positions on marriage do not serve his campaign well.”

Groups like NOM believe that campaign rhetoric is important, but that “actions speak louder than words.” Their theory is that getting candidates to go on the record by signing a pledge might lessen the likelihood that, once elected, candidates will backslide on their issue.