It is obvious that Democrats have failed to succeed in the rust belt, because of racism and xenophobia. We need to appeal to the reasonable moderate conservatives, who just want reasonable things like privatized education and lower taxes for themselves. In addition, Obama showed us that we need to have minority candidates to turn out minority voters.
That is why I've decided to support Castro/Castro 2020
Dems should not leave rust belt for sun belt.
A populist dems will win IA, WI,OH,MI,PA back in 2020.
Even an establishment dem will have way better chance of winning in PA,WI,MI than in AZ, GA in 2020
Dems will not win TX in 2020.
Trump Approval rating already in mid 30s in three closest states of 2016. His approval rating only 42% in iowa.
Mid western states plus PA have 12 senate seats that can't be compensated by Az,Ga. Dems will never have a senate majority if they left rust belt to gop.