"With Jack Abramoff under indictment, a number of readers have suggested that now he might flip and try to offer the feds some figures higher up the food-chain"

In this quote, author Joshua Micah Marshall is going over the possible effects of Jack Abramoff's indictment. He mentions that some readers have suggested that Abramoff might "flip," or comply with the authorities, in order to potentially receive a lesser sentence. By doing so, he might offer information about other individuals who might be involved in unlawful activities, possibly those in greater positions of power. The expression "greater up the food-chain" recommends that these people may hold more influential or powerful positions within the government or other organizations. In general, the quote highlights the potential impact of Abramoff's indictment and the possibility of him working together with authorities.