Democrats, your leading candidate is too weak to count on as a firewall. She might be able to pull off a general election victory against Trump, but then again she might not. Too much is uncertain this year. You, too, need to help the Republicans beat Trump; this is no moment for standing by passively. If your deadline for changing your party affiliation has not yet come, re-register and vote for Rubio, even if, like me, you cannot stomach his opposition to marriage equality. I too would prefer Kasich as the Republican nominee, but pursuing that goal will only make it more likely that Trump takes the nomination. The republic cannot afford that.

Finally, to all of you Republicans who have already dropped out, one more, great act of public service awaits you. As candidates, you pledged to support whomever the Republican party nominated. It’s time to revoke your pledge. Be bold, stand up and shout that you will not support Trump if he is your party’s nominee. Do it together. Hold one big mother of a news conference. Endorse Rubio, together. It is time to draw a bright line, and you are the ones on whom this burden falls. No one else can do it.

Marco Rubio, this is also your moment to draw a bright line. You too ought to rescind your pledge to support the party’s nominee if it is Trump.

Donald Trump has no respect for the basic rights that are the foundation of constitutional democracy, nor for the requirements of decency necessary to sustain democratic citizenship.