OK, folks. We're not going to stick around for the bitter end -- that's what a next day reaction is for (sorry, Nathaniel) -- so with ABC calling Arizona for Biden, that's a wrap. Biden wins all three states tonight, although the margin (especially in Arizona) isn't entirely clear yet.
But it's time for final takeaways -- is Biden the presumptive nominee? Does Sanders hang in? The biggest unanswered question in all this might be that we won't have another primary until early April -- and maybe not even then -- but where does this leave us in the primary moving forward?