WASHINGTON — While pledging to turn down donations from lobbyists themselves, Senator Obama raised more than $1 million in the first three months of his presidential campaign from law firms and companies that have major lobbying operations in the nation’s capital.

Portraying himself as a new-style politician determined to reform the capitol, Mr. Obama makes his policy clear in fund-raising invitations, stating that he takes no donations from “federal lobbyists.” His aides announced last week he was returning $43,000 to lobbyists who donated to his campaign.

The Illinois Democrat’s policy of shunning money from lobbyists registered to do business on Capitol Hill does not extend to lawyers whose partners lobby there. Nor does the ban apply to corporations that have major lobby operations in Washington. And the prohibition does not extend to lobbyists who ply their trade in state capitals including Springfield, Ill., Tallahassee, Fla., and Sacramento, Calif., although some deal with national clients and issues.

“He gets an asterisk that says he is trying to be different,” an analyst with the Campaign Finance Institute, Stephen Weissman, said. “But overall, the same wealthy interests are funding his campaign as are funding other candidates, whether or not they are lobbyists.”