Both men are Republicans who will face each other in a primary.
Additionally, Arnold, who also runs Clear the Bench, which tries to knock "activist" judges out of office, posted the addresses and phone numbers for three Davidson supporters, including 76-year-old former CU Regent Norwood Robb, who called the police.
Arnold pulled the information off his website after he was contacted by the Arapahoe County Sheriff's Office; the Robbs feared that their house would be vandalized.
It's not the first time Arnold has been spanked for his campaign tactics or statements. He's also been criticized for lying about having a master's degree from Johns Hopkins University and for implying that an Arapahoe County Republican group had officially endorsed him when it hadn't.
Sounds like Arnold needs to go back to school.
More from our Shmuck of the Week archive: "Doug Lamborn should be thrown out with the bathwater."