A study by the Center for Political Accountability finds that more public companies are voluntarily disclosing their political spending.  

The survey this year looked at disclosure by the top 300 companies on the Standard & Poors 500 list, up from 200 firms surveyed last year. Of the firms studied, sixty percent disclosed at least some spending on behalf of candidates, parties and political committees. Nearly half described their membership or payments to politically active trade associations, such as the U.S. Chamber of Commerce.

The report is available here, as is the full story at the Washington Post. 

-Anne Tucker