American interest groups are increasingly lining up behind the Democratic or Republican Party and trying to build coalitions within those parties rather than across them. But historically, that has not been the most effective method to bring policy change. Jesse Crosson finds that interest groups are increasingly taking positions on issues outside their areas of expertise in an effort to unite their partisan coalitions. They are facing pressure to toe the party line, but it might prevent the broader coalitions they need to build to pass legislation.