Four years ago today, in the Citizens United v. Federal Election Commission case, the U.S. Supreme Court held that the First Amendment prohibits the government from restricting political independent expenditures for corporations, associations, or labor unions. In the most recent election following the ruling, President Obama spent a record-high amount on his presidential campaign. Unsurprisingly, Citizens United has created a drastic increase in outside spending in presidential campaigns. In addition, Citizens United has caused a significant decrease in the amount of donor disclosure by outside groups. In the 2012 election, $300 million were spent by outside groups with no disclosure of donors.
To find more information and charts about the effects of Citizens United, go here.