If you want to have a better understanding of why the hatred and ridicule has become so deep in this bitter Presidential campaign I suggest you read: The Clinton Rules and The Obama Rules.
Written at his blog The Left Coaster, eriposte explains the new ‘rules’ very well. No matter who you support this is a must read.
The 2008 Democratic Presidential campaign primary has become divisive, not from action by the candidates, but by the actions and hate-filled words of Obama supporters in very aggressive attacks against HRC and her supporters. If you want proof of this reality simply post a pro-Clinton diary at Dailykos.
These ‘Rules‘ seem to make the philosophical foundation for those actions clear, and ultimately very sad, for me.