LINCOLN DOUGLAS a.k.a. "LD" This is a one-on-one debate that changes topics every two months. The debate is more of a value debate than the others, meaning the debaters are for and against the issues based on values, such as freedom vs. national security. Competitors research and prepare ahead of time and will debate both for ('affirmative' / 'aff') and against ('negative' / 'neg') the debate topic during each competition.