These people are going to resort to violence at some point. That point will be when they think it is the only way left for them to keep power.
Mark your calendars folks. If the Dems, especially Obama, are seriously hurting in the polls next summer, you will see genuine violence in the streets. And you will see/hear public calls by liberals to use government power to silence TEA Party types. And you will see liberals (not so subtly) hint that violence should be directed at conservatives.
Large liberal cities are going to be uncomfortable places when this happens.
The press is catching on - they weren't too happy with the Biden remark... Once they start 'getting it", they'll continue.