Senators Bernie Sanders (I-Vt.) and Elizabeth Warren (D-Mass.) appeared side-by-side in Denver on Sunday evening to once again make the case to progressive voters that a vote for Democratic presidential nominee Hillary Clinton is still a vote for "political revolution."

"To every person who 'felt the Bern' during during the primary, America and the Democratic Party know the power and energy of the progressive movement," Warren told the 1,700 who packed the Auraria Campus student union. Sanders won the March caucus in the pivotal battleground state, where Clinton is now polling an average of nine points ahead of Republican rival Donald Trump.

"It goes without saying," Sanders said, "that all of us together have got to do everything we can to elect Hillary Clinton president. But what is equally important is that on November 9th, the day after Hillary is elected president, we continue our efforts because we know what real change is about, what real politics is about, is transforming this country."

Both progressive firebrands touted "the most progressive party platform in the history of the United States of America," which they credited to the millions of voters who supported Sanders during the primary campaign. However, they said that the reforms called for the in the platform which will require defending.

Sanders said that if voters think that Wall Street, as well as the insurance, fossil fuel, and pharmaceutical industries, are going to "go peacefully into the night, you are mistaken."

He laid out the "two-fold struggle" for progressive voters. First, he said, Clinton needs to win by "landslide proportions so there is no doubt in anybody's mind that this country is going to reject that sexism, that racism, the xenophobia of the Trump campaign."

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Secondly, Sanders said that we must "bring millions of people together to create a political revolution and to create a government...that works for all of us that works for all of us, not just the one percent."

"Understand that if we do not get our act together," he warned, "this country is going to slide into oligarchy, where a handful of billionaires will control the economic and political life of this nation and we will not allow that to happen."

Similarly referring to the Republican nominee's allegations that a Clinton win would mean that the democratic process is "rigged" against him, Warren added: "The game is rigged. It is rigged for the Donald Trumps and the billionaires of the world," telling voters "we need your voices and power in this."

On Monday, Sanders is appearing in Boulder, Colorado where he is going to reiterate his support for a state-run, single-payer healthcare system in Colorado. During their speeches, both Warren and Sanders painted that November ballot measure a first step towards delivering the "political revolution," both in Colorado and across the nation.

Watch the speeches below: