The Obama campaign is going up with a huge TV ad buy in Florida, including in the expensive Miami market, according to a senior campaign official.

President Obama, alongside Secretary of State Hillary Clinton, condemns "in the strongest terms" the "outrageous and shocking attack" that claimed the lives of Ambassador Chris Stevens and three other Americans at the U.S. consulate in Benghazi, Libya.

The Obama camp, in fact, is claiming this is the largest and earliest buy in Miami for a presidential contest.

The statewide buy targets 10 media markets -- including Tampa (2,700 advertising points), Orlando (2,700 points), Miami (1,300 points), Jacksonville, Tallahassee, and even neighboring Mobile, Ala.

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This huge buy reflects the Obama campaign's increasing confidence of being able to win Florida, which would potentially deliver a knockout blow to Romney in the race to 270 electoral votes. According to NBC's electoral map, if Obama wins Florida, he would need to win just one other toss-up state to reach or surpass the 270 number.

The ad blitz also appears intended to put pressure on the Romney campaign to spend more in Florida, including Miami.