Before getting started with research, it is a good idea to start with some background and context to the issues you are investigating. The sources below will help you get to that information quickly.
These databases (listed in the order of likelihood they will be useful to you) will get you to news and scholarly journal articles on particular companies, industries, and issues. You can search for things like "Oil industry" Lobbying to get to articles.
Policy analysis organizations will differ depending on your topic, but here are some places to start.
The Harvard Kennedy School keeps a list of US and Non-US Think Tanks and provides a custom Google search across them all. This is a great place to go to find Think Tank content.
The direct influence between lobbying and policy is often difficult to prove - but a good deal of evidence is available in what the lobbying groups reveal about their activities and in how the legislation gets crafted. It is important to look at both sides of the process, starting with the lobbying group or organization. You can check their web sites for statements about the policies they are working on - The American Library Associations Legislation Page for example. Then you can check the hearings and legislation versions in Proquest Congressional for changes recommended by the lobbying groups, etc.
For information on where lobbying money goes - try these resources:
Researching campaigns can be challenging. Different rules regulate required disclosures on local, state and federal levels. The following web resources are all freely available.
Use the following freely available resources to research how the federal government is spending money, including budget-allocations and contracts with 3rd parties.
Use these freely available resources to research how the government is spending money on the local or state levels. Local research is challenging, as each state has its own web sites, rules, and systems for sharing this type of information.
Each State Government will have their own webpage for spending. For example, here is North Carolina's Open Budget website.
There are many ways to track corporations' spending, relationships, and lobbying efforts, but the information tends to be buried or otherwise hard to find. Typically, if information is not required to be disclosed by a regulating body like the SEC in the US, it will be even harder and sometimes impossible to find. Here are some resources and strategies to use.