Wedge issue
A wedge issue is a political or social issue which is controversial or divisive within a usually-united group. Wedge issues can be advertised or publicly aired in an attempt to strengthen the unity of a population, with the goal of enticing polarized individuals to give support to an opponent or to withdraw their support entirely out of disillusionment. The use of wedge issues gives rise to wedge politics.
Political campaigns use wedge issues to stoke tension within a targeted population. A wedge issue may often be a point of internal dissent within an opposing party, which that party attempts to suppress or ignore discussing because it divides "the base". Typically, wedge issues have a cultural or populist theme, relating to matters such as crime, national security, sexuality (e.g. same-sex marriage), abortion or race. A party may introduce a wedge issue to an opposing population, while aligning itself with the dissenting faction of the opposition. A wedge issue, when introduced, is intended to bring about such things as:[1]
To prevent these consequences from occurring, the opposing party may attempt to take a "pragmatic" stand and officially endorse the views of its minority faction. However, this can lead to the defection of supporters of the opposing party's majority faction to a third party, should they lose the debate.