The TaxFairnessWI campaign aims to create a fairer tax system in Wisconsin. The document discusses that while fairness can be hard to define, unfairness is often obvious, such as billionaires not paying state income taxes while others do. It provides examples of perceived unfairness, such as large corporations and wealthy retirees paying little to no taxes. The purpose of TaxFairnessWI is to focus on these issues and push for tax reform that is fair for all residents.