Here's a guessing game: What's the reason Oregon Senator Kate Brown said, as she did this evening, that she will step down as Senate majority leader (and apprently from the Senate)? She said today that she's doing it, but not why.
Let's see. Such moves sometimes happen on occasion of scandal, except that there's been none (that we know of) in this case. Or on occasion of some awful political reversal (as last session's House Speaker Karen Minnis left leadership when her party lost the chamber), but that's not the case here either. Or there could be personal reasons, though nothing there has yet come to light. Another prospect is an impending run for higher office, an idea which is bound to raise some interest. Does she have interest in the U.S. Senate next year, or something else?
Not many answers yet.
UPDATE The first reports on this suggested a resignation from the leadership but not necessarily from the Senate. The Oregonian reports today that later Sunday she confirmed she's planning to leave the Senate as well; this post has been updated to reflect that.