Depressed Mothers Cause of Tea Party Mentality?

The new finding is that 10 year old children of persistently depressed mothers have larger amygdalas. This new finding makes me wonder.......about our society. But-- a little orientation for those of you who don't read about the brain all the time. The amygdala is part of the mammalian or limbic brain, and it is the part that helps us feel fear and loathing, instinctive attraction and lust, and mystical or religious experiences. In other words, the amygdala drives a whole lot of instinct and emotion, and is completely distinct from rational thought. Another recent study showed that political conservatives have bigger amygdalas, whereas political liberals have bigger frontal cortices. So my question is this: is our current generational swing to the right side of the politic spectrum due to a generation of depressed mothers? Or were these mothers inattentive for other reasons? Did the advent of television cause a rewiring of our brains on a population level? Just asking. What other factors could have caused a generational swing toward amygdalic dominance??
( (new article from medscape) )