Today, all of the surviving presidents — George W. Bush, Bill Clinton, George H. W. Bush and Jimmy Carter — met with President-elect Barack Obama at the White House.

Although all the surviving presidents (including Ronald Reagan and Gerald Ford) were present at Richard Nixon’s funeral in 1994, this is the first time that all surviving presidents have met at the White House since 1981.

Since 1981!

That makes this day even more extraordinary.

No matter what your political views are, you have to agree that this is a significant moment in history.