Polarized Agents: Campaign Contributions by Lobbyists
Are professional lobbyists loyal partisans? There are thousands of professional lobbyists in Washington, D.C., who work with members of Congress and their staffs, many of whom also make contributions to congressional candidates and political parties. Although many lobbyists have backgrounds in partisan politics, they may have incentives to give money to candidates from both parties. This article finds that professional lobbyists tend to make personal contributions to their preferred party exclusively.
Gregory Koger and Jennifer Nicoll Victor. "Polarized Agents: Campaign Contributions by Lobbyists" PS: Political Science and Politics 42 (2009): 485-488.
Available at: http://works.bepress.com/gregorykoger/5