What are the most over and under rated demographic trends today?

[Nyvin]

Looking at the national precinct maps,  I really think 2016 is the year that might begin the phase of Republicans "self-packing" into rural areas of the country, while the suburbs move to the Democrats.   At least the suburbs that are fast growing ones.   

There aren't many small town/rural places left in the country where Dems have much support, except minority heavy areas and Vermont.   

Counterwise, there isn't much left of the Mark Kirk-type Republicans that did well in the suburbs of big cities.

[Nyvin]

Another underrated one:

Liberal whites do not really have many kids anymore and tend not to marry until very late in life, while conservative whites are still having a lot of babies.

I think the only High Birth Rate demographic is Foreign Born-Hispanic Women currently. I don't think Non-Hispanic White Women Republicans are having any more or any less babies than Non-Hispanic White Democrat Women.

Your thoughts are wrong; Republican non-Hispanic White women certainly are having more babies than non-Hispanic White Democratic ones. The marriage gap was the best predictor of how each state voted in 2012. Look at Vermont's total fertility rate. Now look at North Dakota's, or even Tennessee's.

This doesn't really affect anything though.   It's a quite meaningless statistic,  there's a reason why data analyst don't look at it much.

[Nyvin]

It really doesn't matter since "no religion" is still easily the fastest growing religious group in there.

They're called "babies" not "clones"

[Nyvin]

Looking at the national precinct maps,  I really think 2016 is the year that might begin the phase of Republicans "self-packing" into rural areas of the country, while the suburbs move to the Democrats.   At least the suburbs that are fast growing ones.  

There aren't many small town/rural places left in the country where Dems have much support, except minority heavy areas and Vermont.  

Counterwise, there isn't much left of the Mark Kirk-type Republicans that did well in the suburbs of big cities.

Trump won suburbs by 5 points. Romney won suburbs by 2 points.

There is way more to the picture than that,  it's quite obvious where the trends are heading towards nationally.  Also Clinton won nationally by 2,   Obama won nationally by 4, so that accounts for a portion of that already.

If you divide it between inner suburbs and outer suburbs the trend would become more clear, also there seems to be a big regional difference.