While both sides are slinging the mud, the ratio is not even. According to CNN, 97% of the McCain ads are negative; 30% of the Obama ads are negative.
ANd CNN is an arbiter of equality how?

They have how many former high level dems working for them as "analysts"?

What % of ads are negative vs. positive is hardly an objective statistic. Speaking of which, there are lies, there are damned lies, and there are statistics.