I sense that this is becoming a new tactic.
Besides running spoiler "libertarian" candidates to split the Republican vote, this is a tactic that Claire McCaskill used to select Todd Akin as her opponent.
It's just another example of how Democrats think outside the box to win elections at any cost, while Republicans dither and fight amongst their own.
When Republicans do play dirty, it's never against the Democrat, for fear of being called mean, racist, or misogynist.
-PJ
I agree. A trend is developing. Republicans fight republican voters with more intensity than they use on democrats in the general election.