SIOUX CITY, Iowa Sen. Elizabeth Warren is finding friendly faces in unfriendly territory for Democrats on her first trip to Iowa since announcing she will almost certainly challenge President Donald Trump in 2020.

The Massachusetts Democrat on Friday and Saturday spoke to overflow crowds that appeared eager to hear her economic populist pitch and her denunciations of corporate greed and a corrupt Washington.

Washington keeps working great for people with money, but not for anyone else, Warren said to a round of applause at a packed theater in Sioux City, promising to end lobbying as we know it.

We need to call it out for what it is: It is corruption, pure and simple. And it needs to stop, she said.

Although she is the first major candidate to announce a likely bid, Warrens visit complete with a throng of reporters following her, a full complement of staff assisting her, and vendors hawking political merchandise outside the rallies seemed to also mark the kickoff to a caucus season that will consume the party for the next year and could see dozens of candidates enter the Democratic fray. Former Housing Secretary Julian Castro is expected to formally announce a bid soon, and other candidates including everyone from former Vice President Joe Biden to California Sen. Kamala Harris to South Bend, Ind. Mayor Pete Buttigeg could launch campaigns in the coming months.

This is how it starts. Person to person. Town to town. Across Iowa and then across America, Warren told a crowd of about 500 in Council Bluffs.

Warrens itinerary took her through western Iowa, starting in Council Bluffs and Sioux City, two midsize cities on the Missouri River that border Nebraska, before a jaunt to Storm Lake, a meatpacking town with a significant immigrant population. All three locales are in counties Trump won handily in the 2016 election, and Storm Lake and Sioux City are in the congressional district of notorious GOP Rep. Steve King.

In Sioux City, she grounded her pitch in her own familys life story, relating how they almost fell into poverty when her father had a heart attack in middle age and her mother feared losing their house, which was saved when her mom got a minimum wage job.

Today, a minimum wage job in America, full time, will not keep a mama and a baby out of poverty, she said, arguing the fight for the middle class has been her lifes work as a teacher, professor and U.S. senator. And it is wrong, and thats why Im in this fight.

She also boasted about her work creating the Consumer Financial Protection Bureau, her defeat of GOP Sen. Scott Brown in 2012, and legislation she passed that will drastically lower the cost of hearing aids.