Numbers as of today. Nationally Biden is leading Trump by 6, Sanders leading Trump by 3. So what about the swing/deciding states. States Trump won.

Wisconsin Biden leading Trump by 3, Trump over Sanders by 2
Florida Biden and Trump Tied, Trump over Sanders by 6
Michigan Both Biden and Sanders over Trump by 5
Pennsylvania Biden over Trump by 4, Sanders over Trump by 1
North Carolina Biden over Trump by 4, Trump over Sanders by 1
Arizona Biden over Trump by 6, Trump over Sanders by 2
Ohio Biden over Trump by 4, Sanders over Trump by 2

Now these numbers are very dynamic, they change constantly. No doubt in my mind that today Biden has the best chance of defeating Trump. At least is more popular in the swing states. What about some solid blue states? States that Trump has no chance.
California Biden over Trump by 26, Sanders over Trump by 32
New York Biden by 25, Sanders by 30

There are others, but the polls are old. But what Iím seeing is Sanders doing better in the solid blue states against Trump, the more liberal and progressive states which are going blue no matter who the candidate is. That Biden is doing better in the more moderate swing states. One can draw the only conclusion at this point is that Biden stands the better chance of defeating Trump. If the election were held today, Biden would receive 92 more electoral votes than Hillary did with Florida a tie, not counted. Sanders would receive 36 more electoral votes with Florida still going to Trump. Hillary received 227 electoral votes, adding Bidenís 92 to that gives us 319 not counting Florida. Well over the 270 needed to win. Sanders would garner 263. Not enough to win if the election were held today, which it is not.

This is by the numbers. They show Sanders more popular than Biden in solid blue states, the more progressive states which Biden going to win no matter what. In the more moderate states, Biden is the strongest and he wins in some of these states, Sanders would lose if the election were today. What good does it do to win California and New York by an extra million or so each while losing in the swing states?
It's high past time that we start electing Americans to congress and the presidency who put America first instead of their political party. For way too long we have been electing Republicans and Democrats who happen to be Americans instead of Americans who happen to be Republicans and Democrats.