Boucher's felony conviction is punishable by up to ten years in prison.
"He is anticipating acquiring an entire determination", Baker said.
He is scheduled to be sentenced on June 15.
Boucher at first pleaded not guilty in November. He suffered six broken ribs.
Rene Boucher is facing jail for tackling the Republican politician in Bowling Green last year and breaking six of his ribs
Baker said Friday that the attack was a "complete lapse in judgment" by Boucher.
Court documents say Boucher saw Paul stacking more brush and 'had enough'.
Paul was mowing his lawn and wearing headphones just before the attack, did not see the attack until the last second and was unable to brace for impact, according to federal court records.
Some residents of the gated neighborhood in Bowling Green had speculated the attack was motivated by a dispute over yard debris.
Boucher and federal prosecutors reached a plea deal in January over the incident, which was one of the worst assaults on a sitting senator in decades and generated weeks of coverage in Washington.
Boucher was released on a $25,000 unsecured bond on Friday and is not allowed to contact Paul or his family.