Rep. Jim Matheson and Sen. Orrin Hatch are the only members of Congress from Utah who were in office at the time of the 9/11 attacks in 2001.

Smart Politics notes that just 36% of those who were in Congress during the attacks are still in Washington, meaning a whopping 64% have left office. 34 Senators and 140 House members and 20 Representatives who are now in the Senate are all that remain of that group.

A much higher percentage of Democrats remain in office between the two chambers, with 112 of the 260 members of Congress still serving today, or 43 percent.

That compares to just 81 of 268 Republicans, or 30 percent.

On the Senate side, 20 of the 50 Democratic members in office on 9/11 still hold their seat today (40 percent).

Republicans, meanwhile, field only 14 of the 49 Senators who were in office at that time (28 percent).

(The chamber's one independent, Jim Jeffords of Vermont, left office in 2007).