...who may be wondering WTF happened in this state such that Kennedy's Senate seat is looking way more likely to go to a GOP candidate than it ever should have,
Brian McGrory does a pretty good job of summing up.
The key points for the TL;DR set:
"Back in December, Coakley beat her closest opponent by 19 points in a primary in which she got stronger by the day.... So what did she do? Apparently, she’s tried to accomplish the impossible. Literally, she all but vanished."
"Scott Brown may not share the political values of most of the state and may lack the experience for the US Senate. And, let’s be honest, his nights probably aren’t tied up with Mensa meetings. But he’s out there hustling, meeting, asking, and convincing. People respect that, a lot."
Also, Coakley's TV ads are some of the most life-sucking counterproductive pieces of drivel I've ever seen. I want to stab out my eyes whenever she comes on the screen. Probably not the best strategy.