If members are elected by majorities from their districts why do interest groups sometimes prevail, even in conflicts with majority opinions?

The short
answer to this question is that government officials often acquiesce to the corporations they
are affiliated with. Many members of government are tied to non-governmental bodies who funded
their campaigns and continue to support them throughout their political careers. There are
political experts who assert that the United States has taken on many elements of an oligarchy,
in which a small number of people, particularly the economic elite, influence
legislation.

A recent example illustrating this argument is the lack of
changes to gun legislation following the recent massacres in Dayton, Ohio, and El Paso, Texas,
in August of 2019. Despite widespread public outcry against governmental inaction and an
overwhelming support for universal background checks, little has changed in terms of gun
restrictions. This lack of change is influenced by a multitude of factors, one of which is the
fact that many members of government, particularly Republicans, are affiliated with the
NRA.