He made it pretty clear that he wanted to hurt a cyclist with his automobile and made it clear that it was only a matter of time before he actually did what he said he would do. You have intent and you have actions taken to help further that intent (he videotaped himself getting ready to do the action and posted his ideas all over the internet). A jury will decide whether this is evidence of the crime charged beyond a reasonable doubt. Nonetheless the first amendment is not a defense to saying you are going to do a crime and then taking some steps to further it.
From US legal definitions,
http://definitions.uslegal.com/r/rec...endangerment/:
"Reckless endangerment is a crime consisting of acts that create a substantial risk of serious physical injury to another person. The accused person isn't required to intend the resulting or potential harm, but must have acted in a way that showed a disregard for the foreseeable consequences of the actions. The charge may occur in various contexts, such as, among others, domestic cases, car accidents, construction site accidents, testing sites, domestic/child abuse situations, and hospital abuse. State laws and penalties vary, so local laws should be consulted."