[pjc50]

It's interesting that there's no norm against participating in this kind of gross dishonesty. Everyone is comfortable that political speech is just a set of things you say to win the argument, and need bear no relation to any real or plausible events.

[oehpr]

I think that it's not that there is no norms, it's that there's no point in having norms. These attack ads are conducted by proxies, not the interested parties themselves. It takes more energy to go after them then it takes for the interested parties to make a new proxy.