Can’t really say I’m surpassed by this, what with the President just off the stage -— and without saying in repudiation of some union thug was exhorting his brown-shirts to violence.
Your allusion (sans evidence) to the Obama/Hoffa incident as a possible factor in this shooting is not unlike the premature reaction of the lefties in blaming Sarah Palin for the shooting of Rep. Giffords.
Even though it is tempting to throw leftist tactics right back in their faces (turnabout being fair play and all), it might be wiser to hold off from making such assertions until more is known about the shooter and his motivations...