WASHINGTON — Today the White House announced the nominations of James Costos, an accomplished businessman and current executive at HBO, as the United States Ambassador to Spain, and Rufus Gifford, a former finance official for the Presidential Inaugural Committee, Obama for America, and the Democratic National Committee, as the United States Ambassador to Denmark. Last week, President Obama also nominated Daniel Baer, the openly-gay Deputy Assistant Secretary of State for the Bureau of Democracy, Human Rights, and Labor, to be Ambassador to the Organization for Security and Cooperation in Europe.