I’ll also add that I’m not sure Casey’s presence in the race lost it for Jenkins. I’ve heard a lot of people say they voted for her in lieu of not voting at all, so I don’t know how many votes she actually took away from Jenkins.
I don't live anywhere near the district, so I can't comment on the sentiment, but statistically it is extremely unlikely that Casey was a spoiler. Something like 95% of her votes would have had to have got to Jenkins to throw the election in his favor, and that seems beyond improbable.