The U.S. Chamber of Commerce today launched a new ad blitz in Hawaii in support of former Gov. Linda Lingle in the race for Hawaii’s open U.S. Senate seat.

The airtime buy from the Republican-leaning business interest group was part of a nationwide campaign targeting four U.S. Senate and 17 U.S. House races.

Similar to an ad run by the Chamber in the islands in February, the 30-second television spot highlights the former Republican governor’s stance on a plan to improve tourism to create jobs and her ability to work in a bipartisan manner.

The Chamber’s ad buy was estimated at about $275,000, a source said. An email to the Chamber’s headquarters in Washington, D.C., was not immediately returned. February’s ad buy cost the Chamber about $250,000, according to filings with the Federal Election Commission.

Nationally, the Chamber’s February buy was reported to be $10 million. The Chamber only confirmed that the ad buy was worth eight figures and was unprecedented in the group’s 100-year history.

Lingle is running in the GOP primary against John Caroll, a former state lawmaker and a former Air Force and commercial pilot. U.S. Rep. Mazie Hirono and former U.S. Rep. Ed Case face off on the Democrats’ side. All are seeking the Senate seat being vacated by Sen. Dan Akaka, who is retiring.