When the Republicans re-built after 2008, they went further to the right philosophically and I imagine the Dems will tilt to the left. My guess is that the part of the left spectrum that supported Sanders is doing a reserved "We told you so" after Tuesday. I don't know if it's the brand that needs to be totally rehabilitated. Voters still resonate to parts of the platform that relate to economic fairness and a lot of union households didn't see Hillary as addressing their needs. The question on the Republican side is whether or not they have captured those voters for a generation or more. I would like to see the Dems reach out more to economically liberal/culturally conservative voters. When I got my start in politics, a large portion of the Democratic base was composed of social oconservatives who had seen the positive results of the New Deal. I think the Democrats' purging of social conservatives who support them on economic issues has been a big detriment to them. Hard to find middle ground on a lot of these social issues, so I don't know if it's possible. Of course, if Trump can't deliver economic benefits to a lot of the Union folks who voted for him, they will be up for grabs again.
As for the people that will head up the Dems, I think Warren becomes somewhat of a leading spokesperson. Corey Booker and Julian Castro will also be featured. Al Franken probably does a lot of promotion. Tim Kaine is probably toast. Hard to know about Cuomo. Schumer has hit his ceiling and given his sentiments about Wall Street, I don't see him becoming a universally popular figure in Democratic circles. Chris Von Hollen is probably a rising star. Problem for the Democrats (and every party goes through this) is how to reconcile their establishment element with their progressive element. Von Hollen is a prime example. He defeated Representative Donna Edwards--who is more liberal than Von Hollen--in the primary. I don't think there are hard feelings in Maryland, but the establishment is going to have to let go a bit if it wants to expand its base. I can't remember where I read the article, but there were complaints after Sanders' fell that the Democrats were running to the middle and playing defense and that golden opportunities, especially in Pennsylvania, were being sacrificed as a result. So that's the fight that will be taking place.