I was just looking at this post over at Swing State Project, and noticed that one of the challengers that is in the best position was none other than Vernon Robinson.
Challenger has 86% of funds as Incumbent.
The post is very pro-Democratic, but this one race pops out.
This is the CQ Politics list (PDF) of top 50 Democratic challengers based on their money alone.
Should we be more worried about Vernon?