I just touched up slides for 2305's discussion later this semester of public opinion - which includes a look at the impact of peer groups like generational cohorts. Changes in public policy quite often are driven by changes in the opinions that each generation holds.
This helps explain shifts in attitudes about gay marriage (also - and more positively - called marriage equality). Grandma and grandpa do not change their opinions on the matter - they just grow old and die and their opinion die with them. These are replaced by their kids and grand kids - who will have the same fate.
There's an underlying cruelty to this.
Andrew Sullivan comments on this and offers this graphic that details the different attitudes within each generation, and why the shifts in attitudes are likely to be long lasting. Note the shifts among Republicans - that's the kicker.
- Click here for the post.