With his stock rising in some early polls and campaign money flowing to him, Beto O’Rourke is headed back to Iowa this week for a string of public events.

Today, O’Rourke begins a four-day run through Iowa that will include at least 10 cities and towns as he tries to build support in the critical early voting state.

The former congressman from El Paso reported raising $9.4 million in his first 18 days as a presidential candidate.

O’Rourke’s haul includes contributions from 218,000 donors — and no political action committees — since March 14, when he joined the crowded Democratic presidential field.

That total puts O’Rourke behind front runners such as U.S. Sens Bernie Sanders and Kamala Harris. But they have also been in the race for much longer than O’Rourke. Sanders announced he has raised $18.2 million since mid-February. Harris, of California, announced she has raised over $12 million since joining the race in late January.

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Pete Buttigieg, mayor of South Bend, Indiana, who has been in the race since late February announced he’s raised $7 million.

O’Rourke’s fast start underscores his growing reputation as a big fundraiser. During the 2018 U.S. Senate campaign, he raised more than $80 million — a record for a Democrat running for Senate.

This will be O’Rourke’s second pass through Iowa, after spending the better part of three days in the eastern part of the state as he announced he would join the race. His trip this week will be focused on central and western Iowa.

O’Rourke’s poll numbers have also climbed since his announcement. In a Quinnipiac University poll released late last week, O’Rourke was the choice of 12 percent of Democratic voters nationwide. Only former Vice President Joe Biden, who is not yet in the race, and Vermont Sen. Bernie Sanders were ahead of him. Biden was the choice of 29 percent and Sanders was picked by 19 percent of the 1,358 people polled from March 21 to March 25. The poll had a margin of error of 3.3 percentage points. Former San Antonio mayor and HUD secretary Julián Castro was the top choice of 1 percent of respondents.

On Saturday, O’Rourke made a three-city stop in Texas, which included a stop in Houston.