Here are some more not on the list above --
In 1983 John Hinckley, a registered Democrat, shot and wounded Ronald Reagan and paralyzed a member of his cabinet.
In 2001 a left wing radical Democrat fired shots at the White House in a failed attempt to kill George W. Bush, President of the US.
In 2010 Jared Lee Loughner, a mentalliy ill registered Democrat, shot Rep. Gabrielle Giffords and killed 6 others.
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The rest of these below are arguably politically motivated. Hard to say for certain with all of them. But what is not hard to say for certain is that they were all lefties --
In 1984 James Huberty, a disgruntled Democrat, shot and killed 22 people in a McDonalds restaurant in San Ysidro, CA.
In 1986 Patrick Sherril, a disgruntled Democrat, shot and killed 15 people in an Oklahoma post office.
In 1990 James Pough, a disgruntled Democrat, shot and killed 10 people
at a GMAC office.
In 1991 George Hennard, a disgruntled Democrat, shot and killed 23 people in a Lubys cafeteria.
In 1995 James Daniel Simpson, a disgruntled Democrat, shot and killed 5 coworkers in a Texas laboratory.
In 1999 Larry Asbrook, a disgruntled Democrat, shot and killed 8 people at a church service.
In 2003 Douglas Williams, a disgruntled Democrat, shot and killed 7 people at a Lockheed Martin plant.
In 2007 Seung - Hui Cho, a registered Democrat, shot and killed 32 people in Virginia Tech.
In 2011 James Holmes, a registered Democrat, went into a movie theater and shot and killed 12 people.
In 2012 Andrew Engeldinger, a disgruntled Democrat, shot and killed 7 people in Minneapolis.
In 2012 Adam Lanza, a registered Democrat, shot and killed women, and children in the Sandy Hook school massacre.
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