This is pretty neat, if you're a politics or history -- or furniture -- geek. Apparently there's a century-plus long tradition on Capitol Hill of senators carving their names into the drawers of their desks.
On the Senate web site there are photos of different desks, all antiques by now, and an accounting of which senators sat where. For example, the desk most recently inhabited by Barack Obama (#XXIV) was previously used by Paul Wellstone, Barbara Mikulski, Paul Simon, Robert F. Kennedy and Henry Cabot Lodge, Jr., among dozens more. Here's the inside of the drawer:

Kinda like prison.
For information on a specific senator's desk, click
here. And for all kinds of tidbits and trivia on Senate desks, such as where all the bipartisan candy is kept, click
here.