January 6, 2016 | 2:18pm

CNN has a long history of allowing political plants to flourish in its public forums.

At the cable station’s Democratic debate in Las Vegas in 2007, moderator Wolf Blitzer introduced several citizen questioners as “ordinary people, undecided voters.” But they later turned out to include a former Arkansas Democratic director of political affairs, the president of the Islamic Society of Nevada, and a far-left anti-war activist who’d been quoted in newspapers lambasting Harry Reid for his failure to pull out of Iraq.

At a CNN/YouTube GOP debate two weeks later, the everyday, “undecided voters” whose questions were chosen included:

• A member of the Lesbian, Gay, Bisexual and Transsexual Americans For Hillary Clinton Steering Committee.