Which candidates can raise enough money to keep this up for another 12 months? That will narrow down the field more than anything else.

Biden and Warren are in the best shape. Sanders is losing financial support (I believe) but maybe not voters (yet). The others don't necessarily want to tell us how much they're raising, but it's going to make a big difference in who's left standing by the time the primaries start up.

It's going to be a long 12 months.