Several of the securities firms, banks, and law firms that are sponsoring the Democratic and Republican political conventions have spent tens of millions of dollars during the past four years lobbying, according to a collaborative study done by the Center for Responsive Politics and The Campaign Finance Institute.

The study released Wednesday details the political contributions and lobbying expenditures of nearly 200 sponsors of the two major political conventions occurring in the next two weeks. Some of the sponsors play a significant role in the municipal bond market. The Democrat's convention is slated to run today through Wednesday in Denver, and Republicans will convene in St. Paul, Minn., next week from Sept. 1 to 4.

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