Marco Rubio told a Miami radio station he would endorse Donald Trump if Trump, the Republican presidential frontrunner, secured the nomination.

"I've always said I'm going to support the Republican nominee," Rubio said, according to the Washington Post, "and that's especially true now that it's apparent that Hillary Clinton" will be the Democratic nominee.

The second part of that quote is particularly telling. Would Rubio have felt more comfortable rejecting Trump and what he means for the future of the Republican party if democratic socialist Bernie Sanders were the Democratic nominee? Who exactly could Democrats have nominated that wouldn't lead Rubio to endorse Trump as the Republican nominee?

Rubio's attitude is markedly different from what it was on the eve of his departure from the Republican race, In March, Rubio called Trump's rise and the violence associated with his political gatherings "frightening" and "disturbing."

Even back then, Rubio insisted he would back the Republican nominee no matter who it was. "But it's getting harder every day," Rubio added.

Since then, Trump has renewed his calls to seal the U.S. borders, slung conspiracy theories after refusing to admit a reporter was roughed up at his event, and called on women who receive illegal abortions to face "some form or punishment," a position rejected by most pro-lifers.

Trump remains as toxic, incoherent, and authoritarian today as he did the day Rubio made extemporaneous remarks that landed him on the liberal feel-good click-bait site Upworthy.

Democrats aren't much better. Even those Sanders supporters who are most adamant about Hillary Clinton making a poor president are likely to bend the knee, or at least hold their noses and vote, for her, come November. Because "the other guy" is worst. Candidates like Libertarian Gary Johnson, the former Republican governor of New Mexico, have an up-hill climb despite the record unfavorable numbers the leading major party candidates have.