Like I said, I disagree with the strategy. I thought it was interesting that Clinton's camp had more popular figures (Obama, Bill, Michelle) make that argument, whereas I didn't hear Hillary herself make it much. It's similar to what the Obama campaign did in 2012 when they rolled out Bill Clinton to argue House republicans were more extreme than anything that came before. All that being said, that isn't what cost her the win. It's not even in the top 3 IMO.
In terms of Obama political management over the last few years (elections) again, I'm confused. 2010 was inevitable. We've discussed this many times but the idea that "50 state strategies" were going to save democrats is laughable. The economy, racial animosity, Obamacare fear, etc destroyed southern democrats. I don't care who the DNC chair is, that wasn't going to be stopped.
2012...republicans lost 8 seats. Dems lost about 12 seats in 2014 but it largely went how you'd expect a midterm to go for the party in the WH.
I don't think Perez or Ellison are some amazing talents who will Change Everything. Both would do a good job. Both will likely receive too much praise when democrats win more seats in 2018.