Lobbyists

I am of the opinion that the government of the United States of America is growing increasing corrupt.  The U.S. has many politicians that change opinion rapidly, almost making 180 degree turns in policies, and different companies and groups making announcements later seem to have impacted some bill or vote in the House or Senate.  The U.S. has groups like "Big Oil", the NRA, unions, PETA, etc. all pushing on the politicians, giving gifts, sending them on trips, and many other such things that are legal, and yet seem to be affecting policy.  Now, I do not believe these groups should be broken up or disbanded, but I do believe they should not be allowed to exert the kind of power they can through money and benefits for politicians.  I believe these groups do do good, but they also do much wrong.  But tell me what you think of lobbying in the U.S. government.