Some religious wedge issues are: abortion, prayer in schools, teaching intelligent design in schools, displaying the nativity at Christmas, saying merry Christmas opposed to happy holiday, etc.
Gun wedge issues: the right to carry hand guns in homes, street, college campuses, the right to defend ones self with a hand gun; the right to own assault rifles, etc.
Can you think of some economic wedge issues?
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"Let's not talk about why you don't have a job, can't afford health care, or can't send your kids to college; let's talk about gay marriage, school prayer, illegal immigration, and flag burning amendments."
http://www.realclearpolitics.com/articles/2008/04/hillary_is_doing_mccains_job_f.html<snip>
"And so people don't vote on economic issues, because they don't expect any body's going to help them. People are voting on issues like guns, are they going to have the right to bear arms. They vote on issues like gay marriage. They take refuge in their faith and their community and their families and the things they can count on. But they don't believe they can count on Washington."
http://www.realclearpolitics.com/articles/2008/04/hillary_is_doing_mccains_job_f.htmlA wedge issue is a social or political issue, often of a divisive or otherwise controversial nature, which splits apart or creates a "wedge" in the support base of one political group. Wedge issues can be advertised, publicly aired, and otherwise emphasized by an opposing political group, in an attempt to weaken the unity of the divided group, or to entice voters in the divided group to give their support to the opposing group. The use of wedge issues gives rise to wedge politics.
http://en.wikipedia.org/wiki/Wedge_issue