Bernie Sanders's back-to-back wins in Indiana and West Virginia give the Vermont senator both bragging rights and increased leverage at July's Democratic convention in Philadelphia. As scolds (like me) insist on pointing out, though, what it does not give him is any increased ability to actually win the nomination. Barring an enormous catastrophe — not a small catastrophe — Hillary Clinton will clinch the party's nomination after votes come in June 7.

There hasn't been much change to the math underlying that assumption in months. The Republican contest isn't over because Donald Trump clinched a majority before Clinton; he'll do so June 7 as well. It's over because his opponents dropped out, while Sanders hasn't. Trump's hold on his nomination continues to be less secure than Clinton's, but because of the way the Democrats give out delegates, it seems as though the opposite is true.

After last night, Bernie Sanders needs about 66 percent of the remaining pledged Democratic delegates in order to pass Clinton's total. Even though he won most of the delegates last night, he won fewer than he needed to stay on track to pass her. So his magic number — the percentage of delegates he needs to win going forward — once again went up.