U.S. Sen. Bernie Sanders rallied supporters in Ames on Saturday, touting everything on his presidential campaign platform from free college to ending the war on drugs.

Sanders is one of only a few liberals challenging former Secretary of State Hillary Clinton for the Democratic nomination.

Sanders, D-Vt., immediately called on help from the crowd to start a “political revolution.” He stressed income inequality as one of the biggest problems facing America.

“The billionaires who own this country cannot have it all,” Sanders said.

Sanders said income inequality is the moral, economic and political issue of today. Sanders warned that income inequality will destroy the country if there is no change.

“In the last two years the wealthiest 14 people saw their wealth increase by $157 billion,” Sanders said. “We need a country and a government which works for all of us, and not just for a handful of wealthy individuals.”

He said reform cannot happen unless millions of people stand up and demand equality.

Climate change is only a controversial issue because Republicans care more about their bank accounts than the environment, Sanders said, calling opposition to climate change science an “intellectual embarrassment.”

“We have the moral responsibilities as keepers of this planet to make sure that we do not destroy it for our kids and our grandchildren,” he said.

Sanders recognized that today’s global economy is very competitive. He said if the country is going to create the kinds of jobs people want and deserve, America needs the best educated workforce in the world. 

The senator said many young people want to go to college, but their families are unable to afford it, calling the situation “insanity.” 

If elected, Sanders said he would support legislation making college tuition at public university completely free and lowering interest rates on student loans. He said the idea is not radical by listing examples of other countries with free tuition, and reminded the audience that the United States used to have virtually free tuition as well.

“We’re going to allow people with student debt to refinance their loans at lower interest rates,” he said.

Sanders was concerned about the human toll, and the cost of incarcerating more people than any other country in the world.

“What are we [going] do? We are [going] end the war on drugs,” Sanders said.

The event was full of seasoned and first-time voters.  

“[Sanders] has no hidden agendas, which makes it easy to trust him,” said Eli Bratsch-Prince, an Ames High School student.

Bratsch-Prince, along with three of his friends in attendance, said they plan on voting for Sanders in 2016.