The Senate Homeland Security and Governmental Affairs Committee gave quick approval this afternoon to candidates for two long-vacant executive branch positions. On voice votes, the panel endorsed the nominations of Dan Tangherlini to head the General Services Administration and Howard Shelanski to lead the Office of Information and Regulatory Affairs in the Office of Management and Budget. Both nominations now go to the full Senate for a final confirmation vote, according to a news release. Tangherlini has been acting head of GSA since April of last year, but President Obama picked him to permanently fill the job only last month. The OIRA post…