While gay marriage is a current hot-button issue for politicians, business leaders have been wrestling for years over whether to offer health coverage to their employees' domestic partners. As employers look into the benefits and costs of covering domestic partners, more and more of them are saying yes--not due to a court order or political pressure but because they think it makes good business sense. Since last year, 34 of the 500 biggest U.S. public companies have started the coverage, bringing the total up to 210, according to the Human Rights Campaign, a Washington, D.C.-based gay and lesbian lobbying group....