“I was on the fence like anybody else,” she said. But now, “it’s like a leap of faith for me knowing he’s trying to do the right thing.”

Her digital ticket request was just a drop in the campaign data collection bucket. According to a tweet by Brad Parscale, the Trump campaign manager who publicly shares data after each rally, the Wildwood event had 158,632 requested tickets. Of the 73,482 voters identified by the campaign as seeking tickets, 10 percent did not vote in 2016 and more than a quarter had at one point been registered as Democrats. That last figure has campaign officials convinced that Mr. Trump is attracting people who are disillusioned with the current slate of presidential candidates, so the campaign cross-references the data it collects from rallies with voter information collected by the Republican National Committee.

“When someone signs up to go to a rally, we can match them up to our big voter file,” said Tim Murtaugh, the campaign’s communications director. “From that we can tell if they’ve voted recently, if they’re a Republican or Democrat, did they move from a different state. When we can identify someone as a supporter, that improves all of our modeling and voter scoring.”

Republican strategists say those numbers reveal that the Trump campaign is focusing not just on drawing in believers, but also on making sure they turn out to vote in November.

“People can be vocal Republicans online and in person but never vote,” Eric Wilson, a Republican digital strategist, said in an interview. “Voters are not necessarily rational actors, and that’s why it’s critical for the campaign to build a one-to-one relationship with them.”