When an issue arises in Washington that is of interest to a group, the group tends to boost its spending.
Interest groups are known as leagues, associations, clubs, or unions. They are protected under the 1st Amendment of the Constitution, which protects people's right to assemble and to petition the government.
In Washington, interest groups are found everywhere and are involved with every level of government. Suppose if an issue arises in Washington, which is concerning and targeting a particular group then that group tend to boost its spending and help one another.
Hence, the answer is given and explained above.
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