Most races got their own page. But the House race was squeezed on the same page as the gubernatorial race. Straight-ticket voters, expecting to vote for one Republican or one Democrat per page, were more likely to mark a candidate in the gubernatorial race and miss the House race entirely.
As it happens, there are many more straight-ticket Democrats than Republicans in the county, according to the paper's analysis, and they've been called "largely responsible for the massive undervote in Sarasota's House District 13 race."
Folks involved in the FL-13 dispute have talked about the ballot design problem from the beginning. But you haven't heard a lot from the Jennings camp about that because 1) there is ample evidence that simple machine malfunction is also a culprit, and 2), as the Herald Tribune points out, ballot design is "a legal dead end for Jennings." Getting a judge to order a new election because voters happened to overlook the race is just harder.
According to the paper, their "experts theorized that straight ticket voters would be more vulnerable to a ballot design flaw because they are looking for three letters -- 'DEM' or 'REP' -- instead of carefully scanning the ballot for a particular candidate." To buffer that contention, the paper points to an attorney general race in two other counties with a similar ballot that also had a high undervote rate, again among straight ticket voters.
Sarasota County Supervisor of Elections Kathy Dent has admitted that the design was a problem and says they won't make the same mistake again.
Of course, even if ballot design was the main culprit, Jennings could still convince a judge that machine malfunction had enough of an effect on the race to warrant a redo.