Romney is the only one of the 8 GOP candidates who had any level of consistency and continued support since February 2011.
Candidates took turns getting their burst although Paul, Bachmann and Huntsman never broke 15% in the national average.
What Kurtz is missing, (albeit purposely) is that 0bozo IS the opposition and one would expect his negative coverage to be more than any one of the 8 - 6 - 4 candidates.
Collectively, there was far more negative coverage of the GOP contenders and 0bozo went relatively untouched.

If Kurtz thought the negative coverage was lopsided before, he, and especially 0bozo are headed for a migraine.