[Maceman]

Common thread is that all of these shooters were progressive liberal Democrats.

Great talking point argument for RKBA: "We need to have guns in order to protect ourselves from murderous Democrats."

[hal ogen]

LIBs with guns near “gun free safe zones” is a potentially dangerous combination. LIBs are mentally ill...ALL LIBs.

[HammerT]

Of course there was this more recent example: [December 14, 2013]

Student On Arapahoe School Shooter: “Very Proud Of Being A Socialist”

The gunman responsible for Friday's shooting at Arapahoe High School in Colorado is being described as a “socialist” by his fellow students.

“He was friendly enough. Very proud of being a socialist. He was very outspoken on his political views,” student Angie Mock said. “To him, it just meant economic — more economic equality.”
http://www.realclearpolitics.com/video/2013/12/14/student_on_arapahoe_school_shooter_very_proud_of_being_a_socialist.html