Who cares about who gets crowned queen and king of some random homecoming prom. Really... This is not the story or the issue. The issue is how do we view birth defects such as down syndrome.
Secondly, I think that people who find out that their fetus has Down syndrome, or any such birth defects, should be allowed to have post-term abortions (I am pro abortion for the first term or so, afterwards, just for special circumstances, this being one of them). Raising a child with down syndrome is more expensive, less rewarding and much more problematic. Depending on how severe the condition is, they can have reduced mental capabilities, reduced physical capabilities, predisposal to other diseases especially cardiovascular, etc.
They aren't called birth defects because they're a blessing in disguise. They're called birth defects because the baby born is defective is some way. And if this offends people, take it with scientific research and go all PC on the medical community.
Now this doesn't mean that if a family decides to keep a child with down syndrome, that said child should be ostracized. But people shouldn't be encouraged to do it because of false slogans like the ones I mentioned: special children or blessing in disguise or due to other social pressures or motivations. Call it for what it is.