Congressional Budget Office (CBO)
"Since 1975, CBO has produced independent analyses of budgetary and economic issues to support the Congressional budget process. Each year, the agency’s economists and budget analysts produce dozens of reports and hundreds of cost estimates for proposed legislation. CBO is strictly nonpartisan; conducts objective, impartial analysis; and hires its employees solely on the basis of professional competence without regard to political affiliation. CBO does not make policy recommendations, and each report and cost estimate summarizes the methodology underlying the analysis."