what are some of the reasons for that change?

Find three polls on the same issue (for example, the death penalty, marijuana legalization, same-sex marriage, or any other policy topic) from three different time periods (such as the 1990s, the 2000s, and the 2010s). The polls MUST be about policy issues (not about a politician, candidate, or election campaign). Compare the polls by type (internet, phone), sample size, and the wording of the questions. Have the attitudes reflected in the polls concerning that issue changed or stayed relatively the same? If the polls show that attitudes have changed, what are some of the reasons for that change? [Hint: Pew Research and Gallup are good sources for public opinion data on policy issues.]