This post is part of an essay from May, 2016.

So what can we make of this 1860 fiasco today, after 2016? If I could attempt a bit of divination I would suggest that the political party that can present the most united front will prevail in the general election. If current Republican candidates continue to employ such wide-ranging, and scorching tones to their rhetoric, and stubbornly defend the innocence of their loose talk, the party may run head long into oblivion, as did the Democrats of 1860. If the roaring factions, currently represented by each GOP aspirant goes too far, the fabric of unity will shred, crippling the Republican’s ability to field serious candidates in the future.

Looking at the past as prelude much is at stake for the unity of the GOP. In 1860 party divisions nearly destroyed the Democrats, propelling the nation into a bloody civil war. And though Republicans at that time elected our greatest Chief Executive, Abraham Lincoln, the Democrats suffered for decades, marginalized as the party of rebellion. And even the best lessons left by the past are still forgotten in the heat of passion, by those who know better. (The Democrats shattered their party unity once again a hundred years later, splintered by the Vietnam War.) This is truly a cautionary tale for today’s turbulent Republican Party.

Zealots do not compromise, and leading GOP candidates are spouting some pretty divisive vitriol. As southern Democrats self righteously rejected their national party 1860, certain it no longer represented them, and ultimately silenced the party of Jefferson and Jackson for decades. The lesson is clear for today’s Republicans. By tolerating demagoguery, extremism, and reckless fear-mongering in their field of contenders, the RNC may indeed face a similar demise.

Though it is true that no party can be all things to all citizens, malignant splinter groups should not run away with the party.

The American public demands measured and thoughtful candidates—and both parties are expected to field candidates of merit and substance.

We deserve leaders worth following.

Gail Chumbley is the author of the two-part memoir, River of January, and River of January: Figure Eight, both on Kindle. Chumbley has written two plays, “Clay” regarding the life of Henry Clay, and “Wolf By The Ears,” a study of racism and slavery.