Martin O'Malley

In order to crack down on other, unsanctioned debates, candidates will have to agree to an exclusivity clause and won’t be eligible to participate in the DNC-backed debates if they appear elsewhere. So far, only independent Sen. Bernie Sanders has joined Clinton in the Democratic field, though former Rhode Island Gov. Lincoln Chafee, former Maryland Gov. Martin O’Malley and former Virginia Sen. Jim Webb are considering running.

Iowa, New Hampshire, Nevada and South Carolina will each host a primary debate, the DNC said. Details haven’t yet been set for the six debates, though the DNC says it will seek “diversity of media outlets, moderators and formats.”