Everybody has a connection with a special interest group that has a lobbyist in Washington.
I belong to AARP--they have a lobbyist.
I am a Catholic--they have a lobbyist
I am a Type II Diabetic--the Diabetes Association Has a Lobbyist
I own three dogs--Animal Rights people have a lobbyist.
I am a writer--News Organizations work hard to protect first amendment rights.
I am opposed to abortions--there is a lobbying group for that and there is a lobbying group for the pro-choice people.
My sister is a breast cancer survivor--another special interest group.
I use oil and natural gas. They have a lobbyist.
Unions have lobbyists.
All groups have some kind of representation in Washington and make some contributions to candidates.
Obviously some make more than others but everyone belongs to some special interest group.
Those that want to protect their second amendment rights belong to the NRA, which as a lobbying group, puts the oil and gas industry to shame regarding influence.
You want to preserve the environment and belong to the Sierra Club--they have a lobbyists.
You are elderly and you want to protect Medicare and Social Security--there are lobbying groups doing that.
The insurance industry, auto industry, construction industry, etc. etc. etc all have representatives seeking to influence members of congress through conversations, donations, in-kind services during campaigns and ways I probably never heard of before.
So if a candidate takes money from a special interest group can he still serve the voters--the answer is yes. You just may not like the way he serves you, depending on which special interest group represents your particular beliefs, needs or ideas.