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( For a .pdf version of this report, click here ) Executive summary Over the past several years, both spending on lobbying and the number of active lobbyists has declined. A number of factors may be responsible, including the lackluster economy, a gridlocked Congress and changes in lobbying rules. CRP finds that the biggest players in the influence game -- lobbying clients across nearly all sectors -- increased spending over the last five years. The top 100 lobbying firms income declined only 6 percent between 2007 and 2012 but the number of registered lobbyists dropped by 25 percent.