The 2016 Republican primary battle is up and running—at least on Google.

Hours after former Florida Gov. Jeb Bush announced he would “actively explore” a run for the White House, the political action committee for Kentucky Sen. Rand Paul, who appears certain to announce a bid for the Oval Office in the coming months, took out a Google search ad on his name, with a not-so-subtle dig at the more moderate Republican.

“Join a movement working to shrink government. Not grow it,” the ad states, with a link to RandPAC, Paul’s longstanding federal leadership committee, and a page asking supporters to give their email address and zip code to “Stand With Rand.” Bush announced Tuesday he would form a similar leadership committee in January. His Facebook announcement didn’t include any attempts to gather data on potential donors or supporters.

Paul’s PAC recently hired on Texas digital strategist Vincent Harris and his firm, Harris Media, in preparation for a 2016 run. Harris had also done work for another likely 2016 contender, Sen. Ted Cruz.

UPDATE: Later Tuesday, RandPAC added a second ad to its digital buy, implicitly attacking Bush’s strong defense of the Common Core education standards. “We need leaders who will stand against common core,” the search ad stated, with a link to Paul’s political action committee.

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