Many campaigns turn negative in a primary when candidates don't disagree on much. Maybe that is why David Cruz Thayne has spent so much energy attacking Julia Brownley.

He has been relentless in the attention towards Julia Brownley. It seems he believes his only way to make the top two is to reduce her favorables. He doesn't seem to pay attention to the other candidates nor does he really discuss policy differences with Julia Brownley.

Why is his campaign so negative towards only one candidate?