Have you heard the one about the president who repeatedly promised that under the Patient Protection and Affordable Care Act, “If you like your doctor, you can keep your doctor. If you like your health care plan, you can keep your health care plan”?

OK, so some readers won’t be amused by that joke.

But rather than relentlessly scowl at political opponents, Americans with a sense of humor should lighten up a bit. On both sides of the aisle. They also should enjoy some needed laughs from the punch lines President Barack Obama delivered at Saturday night’s annual White House Correspondents’ Dinner.

In case you missed it, a few highlights ...

On his visible aging after more than six years in that high-stress job: “I look so old John Boehner has already invited Netanyahu to speak at my funeral.”

On why he’s more relaxed lately: “Those Joe Biden shoulder massages, they’re like magic. You should try one. Oh, you have?”

On Texas Sen. Ted Cruz likening his rejection of man-made climate change to Gaileo’s rejection of our planet being the center of the solar system: “Galileo believed the Earth revolves around the sun. Ted Cruz believes the Earth revolves around Ted Cruz.”

On the reality that many Americans are still suffering economically despite the recovery: “I have one friend, just a few weeks ago she was making millions of dollars a year and she’s now living out of a van in Iowa.”

On a fundraising powerhouse courted by Republican White House hopefuls: “Soon, the first presidential contest will take place. And I for one cannot wait to see who the Koch brothers pick.”

On Vermont Sen. Bernie Sanders: “Some folks really want to see a pot-smoking socialist in the White House. We could get a third Obama term after all.”

OK, so it can be a bit disconcerting when our commander in chief — after all, a position with grave responsibilities — stoops to stand-up comedy.

Still, laughing at ourselves and each other can be mutually therapeutic for us — and our presidents.

And seriously, folks, if we can’t occasionally laugh together, how can we get together on anything else?