You specifically stated an editorial. I have never seen any newspaper that had an editorial that did not have a disclaimer that stated since it was an editorial it did not reflect the views of the company as a whole. Thus, the editorial is a private citizen expressing their views, not representing the company.
As I said, an editorial is the same as a blog post edorsement. These are not the same as a campaign advertisement. However, could it be construed as a campaign advertisement? Perhaps, and if so, then they should be penalized for breaking the law.
The entire point here, is the effect that was bad from Citizens United was not who can make advertisements, but the fact that companies can donate unrestricted amounts of money to political campaigns and do not have to disclose it. Which results in the fact that corporations can effectively buy elections.