These days Washington is not known for bipartisanship, but every now and then a breakthrough is made.

So it is noteworthy that Vice President Joe Biden, a Democrat, and Senator John McCain, a Republican, are appearing together at a forum in Sedona, Arizona on Friday.

The occasion is an annual event staged by the McCain Institute for International Leadership at Arizona State University in McCain’s home state.

Both Biden and McCain have long experience in foreign policy and national security matters. Biden is a former chairman of the Senate Foreign Relations Committee, and McCain has long served on the Senate Armed Services Committee.

They also have a long history in national politics. Biden ran for the Democratic presidential nomination in 2008 in a race ultimately won by President Barack Obama, who later that year defeated McCain, who was the Republican nominee.