Legislative lobbyists collected an estimated $36 million during the first three months of 2012, an increase of about $3 million over the same period last year, according to a report dated Tuesday on the Legislature’s website via the News Service of Florida. The increase likely stems, at least in part, from the earlier start of this year’s legislative session because of redistricting. The session started in January and ended in March, roughly two months ahead of the usual schedule. Among the biggest spenders on lobbyists were AT&T, with an estimated $1.161 million, and firms linked to Miami casino backer Genting, with $445,000, according to the report. Lobbyists were required to submit compensation totals last week, and the new report aggregated those numbers. The numbers are not exact, however, because lobbyists report much of their compensation in dollar ranges.