For the first time, a sitting president was turned out of office.

But no Republican, other than a sitting president, has ever done that.

"Might we have a case next year against a sitting President's wife?"

To be sure, any investigation of a sitting President is difficult legal ground.

Obama’s visit made him the first sitting president to appear on Letterman’s program.

Harrison was the first sitting president to have his photograph taken.

It was the only time a sitting president had visited the town.

The sitting president enjoyed running water and central heat long before most Americans.

This will be my last meeting as the sitting president with the leader of Russia.

And it's another reason why a sitting president would agree to appear on his show.

It will be the first time a sitting president has appeared before the court to stand trial.

Now Obama will be the first sitting president to attend.

But is it a wise move for a sitting president?

No citizen, even a sitting President, is above the law.

He'll be the first sitting president in such a venue.

It isn't unprecedented to name a school after a sitting president.

It's very unusual for a sitting president to be on the attack so soon.

Several students said they came because it was a rare opportunity to see a sitting president.

A sitting President has no time to do his job and defend himself in a civil action.

She will soon decide whether to allow the first legal case brought against a sitting President to go to trial.

Usually there is no serious opposition against a sitting president from within his party if they run for a second, and final, term.

Simply having a different ideology than the sitting president is generally not enough.

Ford was thus the only sitting President who had never been elected to national office.

Stewart has many Americans' attention, and that's just one reason why a sitting president would appear on his show.