She’s likely the first of many who won’t or don’t like being in the minority, are taking their marbles and going home rather than playing along. Short answer, she’s a sore loser who hates being in the minority.
True, but the important thing to consider is that she’s in the minority as of Tuesday, and she’s not resigning.
So the takeaway here isn’t that she doesnt want to be in the minority. It’s that she doesn’t want to be in a minority that lasts more than two years.
IOW she’s concluded that the Dems aren’t getting the Senate back in 2016, or the next couple few cycles after that. If she didn’t think that she’d run again, so she could have at least two years (possbly four or six) to go out as member of the majority.