Far too liberal to play nationwide. Furthermore, Warren at the top of the ticket will be an invitation to Wall Street and other special interests to just open the floodgates against Warren. You will see Democrats get out raised like you've never seen in presidential history. You don't want to piss the big money off.
we'll never know until we try.
seriously, when was the last time the democrats nominated a leftist?
That sounds like Republican logic for nominating Ted Cruz. "When's the last time Republicans nominated a far right nutjob? We won't know unless we try!"
The thing is, "trying" in this case means potentially handing the presidency to the Republicans for at least 4 years and possibly more. I'm not willing to take that risk, not at this point at least.