CNN’S JOHN BERMAN: With us now is Adam, the co-founder of the Progressive Change Campaign Committee, a political action committee that initially backed Platner, but has since pulled its support. Nice to see you this morning, Adam. How do you feel about this convention of some 600 people that's going to select a new Senate candidate in the next 18 days? PCCC’s ADAM GREEN: Well, the stakes are high. And if we want to have a candidate who can defeat Susan Collins by making clear that she was the deciding vote for Brett Kavanaugh and has been a lockstep soldier for Donald Trump, we need the best person possible as the candidate. And we need a really pumped up Democratic Party that is unified. And that's why these questions around how will the candidate get selected are so critical. And there's really two things | would put on your radar. The first is just as your reporter said, will there be ranked choice voting in the convention itself? As was said, Nirav Shah got the most votes on the first round in the recent primary, but he didn't have the most support across the Democratic Party. That was progressive Hannah Pingree, and now she's the nominee. Similarly, we could have a 600-person convention with six candidates, where five of them support taxing billionaires, five of them support Medicare For All and shaking up the system, one of them is backed by Al and crypto and AIPAC and other corporate interests. And that person skirts by with 130 votes if we don't have ranked choice voting. So that is a must. We would not be on a course to defeat Susan Collins if that were true. And the second is how are local counties going to nominate their people, and it needs to be a really wide open process where people feel like not just party hacks, but regular people have gone to the convention itself.