A jungle primary is an election in which all candidates for elected office run in the same primary regardless of political party.
However, in a jungle primary there is no separate nomination process for candidates before the first round, and parties cannot narrow the field. In fact, it is entirely possible that two candidates of the same party could advance to the second round. For this reason, it’s not surprising that the parties haven’t rushed to embrace jungle primaries because they ultimately reduce their power.
This voting system theoretically will elect more moderate candidates, as the victor may appeal to voters of both parties in a two-party system.