Contrary to public perception, she was not a weak candidate.
This is true. She was a very weak candidate.
If she's very weak, than Richard Romero, John Kelly, and that Maloof guy must have had negative infinity abilities as candidates.
You should not that I didn't say anything about previous candidates.
You should also note that Madrid was running in an election which saw a huge swing to the party she's a member of, in a seat that would have been a Democratic target had the election not been one dominated by a large swing to the Democrats.
You should also note that the demographics of this district are quite unlike the sort of district most likely to have a low swing in 2006.