There is a significant lobby for limiting corporate political contributions and requiring disclosures of any contributions (seemingly not matter how small). Part of the premise for this campaign is that corporate political contributions are bad for investors. Well, here's an interesting fact from a recent speech by SEC Commissioner Daniel Gallagher:
... a portfolio invested in companies with the largest lobbying expenditures would have doubled the performance of the S&P 500 over the past year. See Motif Investing, “Kings of K Street” at https://www.motifinvesting.com/motifs/kings-of-k-street. According to this site, from September 2013 to August 2014, this portfolio returned approximately 35%, while the S&P 500 returned approximately 17%.
So if corporate political contributions pay off for investors, why oppose them? Maybe because the opponents of corporate political contributions also oppose policies that are good for investors?