welcome back. very exciting night here in detroit. tonight s democratic debate isn t about who becomes the democratic candidate for president. it s also about whether they can maintain unity no matter what kind of punches we see thrown tonight. joining me is democratic national committee chairman tom perez. thanks for being here. good to be with you. i want to read something that rahm emmanuel said. he said before a party promises health care coverage to undm e n undocumented immigrants, let s help americans and states that are trying to curtail voting rights of citizens. there are a lot of democrats concerned about some of the things talked about at the last debate and might be too far to to left. does that worry you? i look back at the lift of democratic primaries and i think