The U.S. Chamber of Commerce is out with a third round of television advertising on behalf of former Gov. Linda Lingle’s Republican campaign for U.S. Senate.

The chamber’s new 30-second ad extolls Lingle as a bipartisan leader.

The Lingle campaign has been up on the air consistently since June as it seeks to influence voters before the August primary. While Lingle does not have a difficult primary, her campaign is attempting to build momentum for a November general election against either U.S. Rep. Mazie Hirono or former congressman Ed Case, the Democratic candidates.

The chamber also launched new ads in Nevada, New Mexico and North Dakota, other states with competitive Senate races.

“We need leaders in the Senate who understand that free enterprise and not more government will lead the American recovery,”  Thomas Donohue, the chamber’s president and chief executive officer, said in a statement. “Our efforts underscore the importance of electing a pro-business Senate that will be focused on good long-term transportation policy, increased energy production, and fiscal responsibility to bring our economy back.”