Question 1
The purpose of interest groups is to influence public policy and at times support certain political parties and candidates during elections. These political parties and candidates usually favor the interests of the members and supporters of the interest groups. Therefore it should be noted that interest groups are not directly involved in the electoral contest but usually work within the electoral process to promote policy goals.
Question 2
Interest groups commonly influence voters by educating the public on specific policies and their goals. Therefore interest groups can push public opinion in the desired direction. Some interest groups endorse or support specific political candidates to achieve the desired policy goals by members.