As far as past actions leading to this "Great Divider" slogan of yours,you'll have to be more specific.  I've personally not felt this angst you are expressing.

What I do know is that on election night  I listened  to President Obama  give an upbeat speech expressing his desire to unify the nation and work with all--the next morning I listened to Mr. Limbaugh denounce him, yelling "NO we are NOT going to work with you!"  And the assault has continued non-stop, even today, a time we should be thinking as Americans instead of  as partisan attack dogs. Please let us, for even a day, stand united in our grief.  Thank you.