Tornado Alley (PROG)

[ForReal]

The main reason is that Biden can attract moderate republicans and Bernie can't.

There is definitely a split in the Dem Party. Many Bernie supporters threaten to not vote or vote for Trump if Bernie does not get the nomination.

Bernie Voters Threaten to Sit Out Election if Democrats Steal Primary From Him Again

https://davidharrisjr.com/steven/bernie-voters-threaten-to-sit-out-election-if-democrats-steal-primary-from-him-again/