Barack Obama turned down the public funding for presidential campaigns and raked in billions of dollars (and some donations were questionable (Fictitious Donors Found in Obama Finance Records) – more was completely opaque.)
The group Citizens United wanted to air a movie critical of Hillary Clinton and air commercials advertising it. They came up against McCain-Feingold and sued the Federal Election Commission to be able to air the movie and advertise for it near an election. The Supreme Court eventually ruled in their favor.
Hillary Clinton and the Left are very much against the ruling in Citizens United. They want to undo the decision by passing a bill through both houses of Congress and having the President sign it into law. So she rails against money in politics, all the while raking in money hand over fist.
They act as if the Citizens United decision helps only conservatives. Just like they act as if the Religious Freedom Restoration Acts in various states help only Christians. But the Citizens United decision can help people on all sides, as the RFRAs can help more than just Christians. Remember the first RFRA signed by Bill Clinton was enacted to help Native American Indians who wanted to use Peyote in religious ceremonies.
Of course, Hillary has more reason to loathe Citizens United. They made a film that didn’t show her in best of lights.