http://www.vox.com/2015/6/24/8838687/super-pacs-2016-bush-rubio
"In his Citizens United v. FEC decision, Justice Anthony Kennedy said there was no need to put campaign fundraising limits on outside groups. Since these groups weren't connected to the candidates themselves, he reasoned, their spending wouldn't "give rise to corruption or the appearance of corruption."
This year's candidates and their Super PACs are doing their best to prove him wrong. To be more specific, Carly Fiorina, Jeb Bush, and Marco Rubio are doing their best to prove him wrong."
