Two items
Item #1: Someone who is known for holding grudges and being vindictive is not qualified to hold political office. That person will almost certainly abuse the power of that office if elected, to get back at real or perceived enemies. This is very bad for our liberty and the future of our nation.
Item #2: From the Washington Times: Gary Johnson promises to lay off the weed as president. When asked to comment, Johnson said: "Hey mannn... This running for President is a real drag mannn... What were we talking about again mannn... I am so stoned... I have no idea what's goin' on..."
Note for the terminally stupid: The section in italics is SARCASM.