"It's time for new revelations now," the hacker or hackers wrote in a new blog post on Friday, which has been since removed from Wordpress (but lives on in an archived version). "All of you may have heard about the DCCC hack. As you see I wasn't wasting my time! It was even easier than in the case of the DNC breach."

Guccifer claimed responsibility for last year's breach on the Democratic Congressional Campaign Committee, or DCCC, and dumped the phone numbers and private email addresses of Democratic members of the US House of Representatives. Three days later, on Monday, Guccifer 2.0 dumped more documents, this time on the Florida congressional primaries.

While the new dumps by themselves don't appear to reveal anything particularly interesting, they underline the evolution of the Guccifer 2.0 persona from careless, mistake-prone, would-be hacktivist to a more sophisticated, professionally-run leaking operation.