In 1960 about 5% of Americans said they would be upset if their child married someone of the opposite political party.
In 2010 that percentage was 40%.
In 1960, both parties were basically white. Now, one is basically white and the other is mostly not. The numbers you cite are not because of disagreements on statutory corporate tax rates.
Santander makes a very good point here.
To stereotype a bit, the average Urban African American Democrat in Milwaukee and the average WASP White Collar Republican in Waukesha County see two very different worlds.
