As long as government has the power to regulate business, business will control government by funding the candidate that legislates in their favor. A free-market thwarts lobbying by taking the power that corporations seek away from government! The only sure way to prevent the rich from buying unfair government influence is to stop allowing government to use physical force against peaceful people. Whenever government is allowed to favor one group over another, the rich will always win, since they can "buy" more favors, overtly or covertly, than the poor.
...some student asked if he [Larry Summers] didn’t have essentially the same relationship with Bob Rubin. Wasn’t Summer’s opposition to capital controls just a sop to Wall Street banks, which wanted to recoup their risky investments regardless of how doing so affected the country in which they had invested? “Summers just lost it,” said one audience member, a business school student. “he looked at the person and said, “you don’t know what you’re talking about and how dare you ask this question of the president of Harvard?