Before the first Democratic presidential debates kicked off last week, close to 100 Pete Buttigieg supporters and donors sheltered from the Miami heat in a Hilton hotel conference room, where Buttigieg’s senior staff briefed them on the campaign’s transformation from shoe-string operation to $25 million enterprise.

The officials didn’t reveal Buttigieg’s field-leading second-quarter fundraising total then, but what they did discuss is more important in the long run: how Buttigieg plans to spend the money.

For months, the South Bend, Ind., mayor has run one of the more frugal 2020 campaigns, eschewing on-the-ground organizers in early caucus and primary states and instead focusing on fundraising, media appearances and the candidate’s travel. But Buttigieg is now rapidly expanding his campaign’s footprint to try and build on his gains in the first half of the year.

In Iowa, Buttigieg’s campaign added 30 organizers at the end of June, filling out what had previously been a four-person skeleton crew. A dozen staffers are now on board in New Hampshire. And by the end of the summer, there will be many more: The campaign plans to swell its staff to 300 people by Labor Day, according to multiple people briefed on its plans.