You can filter CRS reports by Congress.
Congressional Publications - no citing functionality.
CQ Researcher and CQ Weekly, listed below, are available through the larger CQ Press Library. Keep searches simple in these resources.
Newspapers on ProQuest platform - citing functionality available. See "Cite" when you view a record.
Newspapers, magazines, journals etc. through the EBSCOhost platform - citing functionality available. See "Cite" when you are at a record.
This Google Custom Search box searches selected think tank websites.
If I add daterange:2455198-2456443 after my search terms, then this Google search will limit to items indexed after 1 January 2010.
Newspaper and magazine articles may refer to groups or think tanks that have an interest in a specific bill. Consider searching for that group's website.
Some think tanks may be more right or left leaning and may have expressed opinions on a specific issue. Limiting a search to site:.org or site:.edu with your terms will sometimes surface these organizations.
Example: "net neutrality" site:.org
Consider looking at specific think tank site. e.g. Rand Group, Brookings listed here.
Once at a site, look for About Us information to determine the ideology. Often these sites will note where they are on the political spectrum (in their viewpoint). When reading a group's publications, determine if there is a specific bias or ideology that is promoted.