Why isn't Democrat Rene Boucher facing more serious charges for attacking Senator Rand Paul?

NBC: Rene Boucher in court for his arraignment

I am sure politics was a motivation in this attack (and that escalates potential sentencing penalties considerably), but regardless Rene Boucher blindsided Rand Paul and seriously hurt him. That alone should warrant serious felony charges (whether they get negotiated down is between the prosecutor and the defense lawyer). The idea that is ok for Democrats to attack Republican officials needs to be completely rejected.  

The media have mostly been shameless, carrying water for Boucher and trying to blame the victim.  Turns out the Pauls are nice neighbors who get along with everyone in the community (except Boucher). But even if they weren't, blindsiding someone while they have earphones and seriously injuring them warrants serious charges.

TOM: Can Roy Moore Still Win?

AoSHQ: Boucher may be charged federally (good)

Rush Limbaugh: The Left Encourages Violence Against Right

Powerline: Rand Paul's Neighbors Dispute "Property Dispute" Defense

Legal Insurrection: All signs point to politically motivated attack on Senator Paul

Right Scoop: Fox News says federal charges are expected atainst Rene Boucher, may be politically motivated (good if true)

Instapundit: Violent Dems, Even Vox is confused why more isn't happening, Debunking Fake News, Media Bending Over Backwards To Defend Thug Boucher, They hate us, they really hate us, Democracy dies in Doxxing, Sneak Attack, Possibly Politically Motivated, Senator Rand Paul's injuries more serious than previously reported, Media ignore violence against Republicans