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Barack Obama was comfortable rousing partisans with jabs at the GOP at a convention and singing "Amazing Grace" in Charleston, South Carolina.

Think back to FDR and it's easy to recognize that modern presidents have often shown the world different sides depending on the moment, but always in the context of a steady personality.

Then there is Donald Trump, who also has shown two sides, most dramatically in the past 10 days. After giving a measured statement last week condemning hatred and violence in Charlottesville, Virginia, he struck a wildly different tone in an exchange with reporters the next day, drawing widespread condemnation by appearing to equate the far right protesters in that city with those rallying against bigotry.

Then this Monday, he swung back to his earlier tone when, in a speech on his new Afghanistan policy, he condemned hatred and division.

Finally, having apparently strained to act appropriately on Monday, Donald Trump returned from his bad boy timeout Tuesday to address a Phoenix crowd as the familiar, raging and erratic character who appears at his rallies.

He once again bashed the mainstream press and senators in his own party. Then he distorted his record on the racial tragedy in Charlottesville, reminding the world that he lacks the moral core that has allowed previous presidents to display strong personalities while keeping faith with a nation that needs a stable leader.

The fact is, many presidents have been adept at showing different sides to different audiences, but all in the service of a sensible set of goals. Trump's wild tacking from one personality to the other is self-destructive.

If an instrument were devised to measure Trump's mood -- call it a Trumpometer -- it would generally register on the far right-hand side of the scale. This is where "Reckless Trump" muses about the "very fine people" who joined the recent march of the racists in Charlottesville, which culminated in a deadly vehicular attack on anti-hate demonstrators. Heather Heyer died, many more were injured.

Scripted Trump appears when the President is persuaded to accept a little discipline -- and a teleprompter. His first State of the Union speech was delivered with the aid of the machine and he got generally positive reviews.

By denying the facts about Russia's effort to influence the election, Trump neglected his duty to defend American democracy and respect the intelligence services that help safeguard the nation. He did, however, soothe his concern that others might see his election as tainted, and his ego requires this comfort. When Reckless Trump is in the room, it is easy to see that ego is his main concern.

Although Reckless Trump often sabotages his own agenda, he causes the greatest damage when he indulges himself on an issue that is vital to both public safety and national unity.

The Trump Tower performance was a wild swing away from the more reasonable statement he had made just the day before. It also fit a pattern. When Trump has chosen to moderate himself, to be more like other presidents, he has often snapped back almost immediately to his more combative identity.

For his Monday Afghanistan speech, he pulled himself together for the teleprompter session, which included a reminder that, "loyalty to our nation demands loyalty to one another. Love for America requires love for all of its people."

After all, this is the man who likes to keep people in suspense, wondering which version of him will appear, which has the effect of casting doubt upon every statement. Indeed, as if to prove he's not to be trusted, Trump followed his Monday peacemaking remarks with a trip to Phoenix, where local officials had asked him to stay away because they feared violent protests.

What were people upset about? Well, Trump was reportedly considering a pardon for recently convicted ex-sheriff Joseph Arpaio, whose anti-immigrant demagoguery has made him a living symbol of prejudice for many Americans.

"I've started to use them a little bit. They're not bad. You never get yourself in trouble when you use a teleprompter. You know, the problem is, it's too easy. We have a president who uses teleprompters. It's too easy. We should have non-teleprompter speeches only when you're running for president. You find out about people. The other way you don't find out about anybody."

Read more:
Donald Trump is a president at war with himself - CNN