House Speaker Nancy Pelosi, a California Democrat, speaks during a news conference in Washington. Photographer: Andrew Harrer/Bloomberg

As President Barack Obama thrashes Republicans for allowing "special interest takeovers of our elections,"� his Democratic Party is benefiting from millions of campaign dollars brought in by lobbyists.

Lobbyists raised at least $1.5 million in the first six months of the year to help elect Democrats to the House, according to a report from the Democratic Congressional Campaign Committee. That was the most of any congressional fundraising committee and almost three times as much as the House Republican campaign committee took in from lobbyists.

While Obama criticizes the influence held by lobbyists...