Does anybody really know what President Obama’s position is on the Ground Zero mosque?

Does he even know?

At first glance, he seems to be saying that its supporters have a right to building so close to the World Trade Center site — but that doesn’t mean that they should.

But it’s really difficult to tell.

“I believe that Muslims have the same right to practice their religion as everyone else,” he said Friday, “and that includes the right to build a place of worship and a community center on private property in Lower Manhattan.”

But he was back-pedaling Saturday: “I was not commenting, and I will not comment, on the wisdom of making the decision to put a mosque there.”

Then, yesterday, the White House insisted his position was unchanged.

Go figure.

Supporters initially hailed Obama’s remarks at Friday night’s dinner for iftar (which marks the start of the Muslim holy month of Ramadan) as a heroic affirmation of freedom of religion — with some calling it a “defining moment” of his presidency.

Then came Saturday’s waffle.

So much for defining moments.

Actually, Obama’s failure to endorse building at the proposed site — especially given the initial reaction to his remarks — speaks volumes.

Most opponents concede the right to build — spectacularly inappropriate though the chosen site may be.

And now come reports that Mahmoud al-Zahar, Hamas’ co-founder and its chieftain in Gaza, backs the project.

This should complicate things for mosque honcho Imam Feisal Abdul Rauf, who famously refuses to label Hamas a terrorist group.

For sure, Rauf’s insistence that a mosque so near to Ground Zero will build bridges is not working out.

Poll after poll shows an overwhelming majority of Americans opposed to building a mosque and Islamic cultural center there — and even Senate Majority Leader Harry Reid yesterday called for the mosque to be built “someplace else.”

Obama had an opportunity to show real leadership on this issue. Instead, he made an even bigger muddle of it.

That’s not surprising — but it is sad.