Roger Lau made the comments in a memo to Team Warren activists revealing plans for a new “eight-figure” TV and digital advertising campaign aimed at primary voters in New Hampshire, Nevada, Iowa and South Carolina - the first four states to pick their favourite Democratic candidate for 2020.

The memo also announced that the Warren campaign is “significantly expanding” its organizing team in states voting after those four. State directors and organizers in states choosing a candidate after March will be among the fresh Warren campaign hires.

In his Medium blog for activists, Lau wrote: “Remember: this election is about more than just beating Donald Trump — he’s just the worst symptom of a corrupt system.

“If we want to make big, structural change, we need to make sure Democrats control the U.S. House and Senate and win important gubernatorial and state legislative races across the country.”

“We’ve released dozens of plans in the past seven months, but they’re really one big, simple plan: to break the stranglehold of corruption on Washington and put political and economic power in the hands of the people, where it belongs,” Lau also wrote.

Democratic Representative Alexandria Ocasio-Cortez previously described Trump as a “symptom of much deeper problems” in a tweet earlier this year, adding that a “REAL conversation” was needed in the U.S. about issues such as income inequality and racism.

Writing about Massachusetts Sen. Warren’s aim to keep control of the House and Senate should she be selected as the Democratic 2020 candidate, Lau said the campaign was putting resources into “places that will be critical to keeping the House” and winning a majority in the Senate.

The campaign manager highlighted Illinois and California as examples of two states where Democrats won seats in close races that they will need to defend when voters go to the ballot in November next year.

He also said Team Warren was “putting boots on the ground” in areas which could “help flip state legislatures”.

Real Clear Politics polling averages put Warren almost 10 points behind frontrunner Joe Biden and two points ahead of progressive rival Bernie Sanders.

But in an average of Iowa Democratic caucus polls she leads the pack with a three point lead over former Vice President Biden.