A Bartlesville man pleaded guilty on Wednesday to cyberstalking and threatening to kidnap and assault U.S. Rep. Kevin Hern and his wife. Keith Charles Eisenberger, 39, made “concerning statements” dating back to November 2018, when Hern won his first term in the 1st Congressional District, with the threats escalating on social media and during visits to Hern’s offices in Tulsa and Washington, D.C., according to the U.S. attorney’s office in the Northern District of Oklahoma.