WaPo:

The 2016 campaign has already seen the highest rate of corporate donations since the Supreme Court unleashed such spending with its 2010 Citizens United v. FEC decision.

One out of every eight dollars collected by super PACs this election cycle have come from corporate coffers, including millions flowing from opaque and hard-to-trace entities, according to a Washington Post analysis of federal campaign finance filings.

So far, 680 companies have given at least $10,000 to a super PAC this cycle, together contributing nearly $68 million through Jan. 31, The Post found. Their donations made up 12 percent of the $549 million raised by such groups, which can accept unlimited donations.

That means corporations are on track to far exceed the $86 million they gave to super PACs in the entire 2012 presidential cycle, when such donations totaled 10 percent of the money raised by such groups, according to data from the nonpartisan Center for Responsive Politics.

Many corporate givers this cycle are well-established hedge funds, energy companies and real estate firms. But a significant share of the money is coming from newly formed LLCs with cryptic names that offer few clues about their backers.