Then you will vote for no one. They all run negative ads and so do their super Pacs, especially.
Having run for office in the past, I can't in good conscience vote for any candidate who does a negative ad. All of the presidential candidates blew it in the primary season. Just have to wait and see what happens in the leadup to the general election. But it's not all hopeless. My current congresscritter (a Republican) in his first terms ran an almost ridiculously clean campaign in 2014. I gladly trusted him with my vote. He voted to keep Boehner on as Speaker when the session began but I've since forgiven him that mis-step.
And to answer another freeper: anyone think that Hillary won't run negative? PPPPHHHHHAAAAHAHAHAHAHAHAHA...
That woman racked up enough negative as First Lady in her husband's first term that I wouldn't vote her for city sanitation engineer.