"So it was about voting rights, and big money and politics, corruption, and also about having courts that work," Freechild said, referring to the aim of the protests held as the 2016 US presidential campaign kicks into high gear and money in politics becomes a heated topic.

"Our entire system is dependent on big money donors. It's not impossible to run without big money as Bernie Sanders is showing, but it's very difficult to win," Freechild said.

She was talking about the Vermont senator who is mounting an impressive challenge to Democratic front-runner Hillary Clinton, former Secretary of State and wife of former US President Bill Clinton. Rather than raising fund from big donors, Senator Sanders has been relying on small donations, usually in form of 27 dollars, from grassroots supporters.

New York Times has said in a report that a small pool of rich donors dominates the campaign funding in the 2016 presidential race, highlighting the unprecedented concentration of political donors in the modern era.

Corporations, industries and a handful of extraordinary wealthy individuals spend big money on campaigns and on lobbying not for fun, but because they expect to get something back in return.

The Sunlight Foundation, a nonpartisan nonprofit organization, has said in its research that a total of 200 organizations spent a combined 5.8 billion dollars on federal lobbying and campaign contributions during 2007-2012 period, and they received 4.4 trillion dollars in federal business and support.

In a rough sense, for every dollar they spend on Washington, the biggest companies in the United States are getting more than 750 dollars back.

Former US President Jimmy Carter has called the current US political system an "oligarchy," saying "with unlimited political bribery being the essence of getting the nominations for president or to elect the president ... We've just seen a complete subversion of our political system as a payoff to major contributors."

Unlimited money in politics violated the essence of what made America a great country in its political system, he said.