President Obama met the man who will succeed him in the Oval Office and said something I found most interesting — and revealing.

The president turned to Donald J. Trump and offered his full support during the transition. “If you succeed, the country succeeds,” the president said.

Imagine that. The man who called Trump “unfit to be president” now is wishing him success as he prepares to seize the levers of power.

Holy cow, man!

Why is that worthy of comment? Consider the kind of things that many conservatives said in 2009 as Barack Obama succeeded George W. Bush as president.

A lot of them — namely many of them talk-radio blowhards — were actually urging failure for the president. They didn’t care about the consequences of failure. They failed to connect the nation’s fate with the president’s performance. They didn’t understand — or refused willfully to understand — that the nation suffers if the president fails.

The Senate’s Republican leader, Mitch McConnell, declared that his No. 1 priority was to make Obama a one-term president. How does he do that? By ensuring failure at every step.

President Obama deserves high praise for insisting that Donald Trump’s success bodes well for the nation.