Answer: Interest group provides a much needed information gathering service for politicians. They don't have too much power.
Explanation: interest group are group of people who come together with one major interest to seek from the government. Examples of this group are the U.S chamber of commerce.
This group helps the politician to get information of the people's need and know how to approach the people. The politician look into the interest of all it's interest group and their try to campaign with the solution of those interest, so that they will be the choice of the people.
Interest groups does not have too much power, because they are still under the law, and under the decision of the president. though they interest affect the decision of the president most times.