Longtime Trump confidant Roger Stone apparently wasn’t the only Republican political operative in touch with Guccifer 2.0, the alleged front for Russian intelligence agents that hacked the Democratic National Committee last year. According to a new report from The Wall Street Journal, another, lesser-known G.O.P. strategist was also in contact with the hacker at the height of the 2016 presidential election: Aaron Nevins, who runs the obscure HelloFLA blog in Florida. (Stone has acknowledged exchanging messages with Guccifer 2.0 but has denied any wrongdoing.)

Learning that hacker “Guccifer 2.0” had tapped into a Democratic committee that helps House candidates, Mr. Nevins wrote to the hacker to say: “Feel free to send any Florida based information.”

Ten days later, Mr. Nevins received 2.5 gigabytes of Democratic Congressional Campaign Committee documents, some of which he posted on a blog called HelloFLA.com that he ran using a pseudonym.

Soon after, the hacker sent a link to the blog article to Roger Stone, a longtime informal adviser to then-candidate Donald Trump, along with Mr. Nevins’ analysis of the hacked data.

“I just threw an arrow in the dark,” Nevins said during an interview with the Journal. But he quickly realized that the data he had received was even more valuable than Guccifer 2.0 likely realized. “Basically if this was a war, this is the map to where all the troops are deployed,” Nevins told the hacker in a series of exchanges reviewed by the Journal. Democrats, Nevins told him, probably “spent millions probably to figure out who these people are that are conducive to their message and now it’s exposed for the other side.” Nevins posted the analysis to his blog, making easily available a set of voter analysis data for a number of critical battleground states including Pennsylvania, which Trump won by less than 70,000 votes.

Nevins’ exchanges with Guccifer 2.0 appear to represent the first confirmed evidence of a G.O.P. operative and an alleged Russian intelligence entity working together to tilt the 2016 election for Republican candidates. Nevins told the Journal that he isn’t convinced Guccifer 2.0 actually represents Russian interests, but that it was irrelevant either way. “If your interests align,” he said, “never shut any doors in politics.”

Whether the collaboration impacted any elections is unclear. But at least one campaign consultant adjusted his strategy based on the stolen data set Nevins received. “I did adjust some voting targets based on some data I saw from the leaks,” Anthony Bustamante, who served as a campaign consultant to Republican congressional candidate Brian Mast, told the Journal. Mast won.