There are several, but to name a couple, there is lobbying and engaging in rating games. Lobbying allows them to meet with the senators and congress men. Engaging in rating games such as the "dirty dozen", helps give them voice.
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Answer this question… political parties.
Interest groups lobby policymakers.
interest group
Lobbying.
Because its goal is to directly influence legislation, the courts have ruled that limitations on lobbying for interest groups are legitimate.