Some political issues arise in order to drive a wedge within a group or party.
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A wedge issue is a political or social issue, often of a controversial or divisive nature, which splits apart a demographic or population 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. Wedge issues are also known as hot-button or third-rail issues.
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.
. . . some Republican strategists have hoped that African Americans, a traditionally Democratic voting bloc, yet also one that possesses some of the most conservative views on matters of homosexuality, may be more inclined to vote for the Republican Party because of their opposition to gay marriage. In 2012, internal National Organization for Marriage memos dating to 2009 were released that stated that they sought "to drive a wedge between gays and blacks" by promoting "African American spokespeople for marriage", thus provoking same-sex marriage supporters into "denouncing these spokesmen and women as bigots", and to "interrupt" the "assimilation" of Latinos into "dominant Anglo culture" by making the stance against same-sex marriage "a key badge of Latino identity".
. . . Reform of the laws regarding illegal immigration to the United States operated as a wedge issue in 2007. Some Republican legislators, with the backing of President George W. Bush, sought to address the dual issues of ongoing illegal immigration to the United States and the illegal status of an estimated 12 million people currently living in America. Other Republicans bitterly opposed any "amnesty" for illegal immigrants, out of fear that their constituents were unsupportive of immigration reform. Some Democrats pitched in to keep the issue alive as they recognized the issue was deeply dividing the Republican party between advocates of reform and advocates of the status quo. The result was a bitter division in Republican ranks and a stalled bill in Congress. After the election of Donald Trump in 2016, the views of American voters shifted to align more closely with their parties along partisan lines, reducing immigration policy's status as a wedge issue.