Let's hold off on writing Kay Hagan's political obituary until after May 6, alright?

[youtube http://www.youtube.com/watch?v=yqkN-OlzeNI&w=620&h=315]

Here's the basic math on the 2014 Senate elections: Republicans need a net gain of six to take control of the upper chamber. Tim Johnson (a Democrat) from South Dakota is out, and his seat will almost assuredly flip. That takes the number down to five needed, net-gain wise. There are variou…