Where politics is implicitly ‘all about the money’ but explicitly about ideals and votes, the institution of ‘lobbying’ naturally appears. Lobbying today is legitimized and openly accepted as a means of influencing the development of legislation. In a true politics, this practice is called bribery, and the conspicuous absence of any concept of bribery from contemporary political vocabulary speaks volumes. We have no concept of bribery because what that term signifies is the basis of our system.
If electioneering is money-at-work leading up to and during an election, lobbying is money-at-work after the election ends. If the elected officials are (nominally, at least) the representatives of the people, lobbyists are the representatives of money sent to the legislature to assure that money has the final say.
One of the weaknesses of the party system is that it reduces parties to two only, and that means two candidates for each election. This means that if a private interest has enough money to influence both sides so that it can put its own man forward on each side, then it can’t lose. And this has often been the case.