Calling this attack an 'assault' is fine, or even better "assassination attempt". But to call it 'terrorism' would be to confuse it with the term we often use when Muslims or ISIS are the perpetrators.
Sorry, but this is a case of terrorism as defined by the FBI and federal code. The murderer was trying to intimidate a political party and its elected representatives in the furtherance of political objectives.
We have a history of domestic terrorism like the Black Liberation Army, the Weathermen, Ayran Nations, Animal Liberation Front, etc.
"Terrorism is defined in the Code of Federal Regulations as “the unlawful use of force and violence against persons or property to intimidate or coerce a government, the civilian population, or any segment thereof, in furtherance of political or social objectives” (28 C.F.R. Section 0.85)
Terrorism is a practice, not a belief system, and the FBI properly defines it as, “the unlawful use of force or violence against persons or property to intimidate or coerce a government, the civilian population, or any segment thereof, in furtherance of political or social objectives.”, as noted at post no. 14. Thus, it can be Islamic, communist, Nazi, KKK, or by anyone else who engages in the defined actions. By that definition this was a direct, deliberate act of terrorism. The FBI is willfully violating its own rules to cover for the DemonCrap party, just as Obola did in the case of Nadal Hassan, the Fort Hood Islamic terrorist.