This is the richest landscape that I have ever seen for third party candidates to get elected. If I were running for Congress the last thing I would want to do is run as a Dem or Rep.
This is very hard to do, since congress/state-office candidates must rely on grass-roots pubs/dems as a source of volunteers. The volunteers that help a campaign are the most active, and probably also active in the local pub/dem committees.
If your opponent were "congress" you might win. If all congressional districts were polled, concerning their own congressman, you'd see quite different results. it's generally the other guy's congressman who is worthless.
You'd get beat because most people vote one or the other...and NOT for what the candidate stands for.