From Newsweek:

The effort began in earnest in late 2007. Ogilvy, one of Visa’s outside lobbying firms, picked off one of Pelosi’s government-affairs advisers, Dean Aguillen, who had close ties in the speaker’s office. Aguillen quit the speaker’s team and went to Ogilvy in December 2007. By law he was unable to lobby his former boss for a year, but he immediately registered to lobby Congress on the credit-card issue, offering guidance to other lobbyists on Visa’s team during strategy sessions, according to a lobbyist present in strategy deliberations.

Visa wanted to meet with Pelosi and her top aides to make the case against the swipe fees. That summer Visa’s outgoing CEO, Carl Pascarella, bumped into Pelosi on the street in the San Francisco neighborhood they share, and she arranged for him to contact her Washington office for a meet-and-greet, according to sources families with the encounter.

Around the same time–on July 21, 2008, to be exact–Pelosi’s reelection campaign received a $1,000 donation from Visa’s political-action committee. Two days later, according to Pelosi’s office, the speaker met Pascarella and the incoming Visa chief executive, Joe Saunders, in her Capitol Hill office. The three exchanged pleasantries and no specific legislation was discussed, according to Pelosi’s office.

Aguillen, for his part, also contributed $1,000 to Pelosi and another $1,000 to the Democratic Congressional Campaign Committee during the first half of 2008.

Separately, Pelosi’s husband, Paul, a major investor in California, got a lucrative phone call–a pre-screen invite in March 2008 to take part in Visa’s $17.9 billion public stock offering, at the time one of the hottest stock offerings in an otherwise soft market.

The initial-public-offering price was $44 per share and was limited to institutional investors and a group of specially selected individuals. Almost $18 billion was made available in public stock to preselected investors. Paul Pelosi made the cut.

The top financial institution to handle the sale was Wells Fargo Shareholder Services, a bank where Paul Pelosi, a seasoned investor, held an account. Before the IPO, Pelosi received a call from his financial adviser at Wells Fargo alerting him that he had been approved to purchase Visa stock and, considering the public buzz around the stock, recommending he buy, according to Pelosi’s office.

Paul Pelosi initially bought 5,000 shares at the $44 initial price. Within a couple of days, the shares’ value soared to $64. Paul Pelosi purchased 15,000 more shares over the next three months, at much higher prices. The total quantity was valued as high as $5 million, according to the then-speaker’s financial-disclosure form. In late 2008, when the stock market soured, Pelosi sold 1,000 of the first IPO shares for a meager profit of $2,500 to $5,000, records show. He has kept the other 19,000 shares, which now are valued at $95 each.

Nancy Pelosi’s office denies that the meetings, the lobbying, or her husband’s stock purchase had any influence on her legislative actions. Drew Hammill, a spokesman for the Democratic leader, said Paul Pelosi’s finances are kept distinctly separate from the congresswoman’s legislative work, and she complies with all the legal as well as ethical obligations of her position. He also pointed out that Pelosi has repeatedly advocated for legislation the credit-card industry dislikes.

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