I think the spoiler effect isn't very existent here, Corwin's favorables were terrible, that would indicate to me that it wasn't all about Davis pulling votes away from her. We also don't know just what percentage of Davis votes weren't going to support her at all, it may have been enough where the result was not spoiled.
You're also forgetting that Corwin spent most of the campaign attacking Davis rather than Hocul. It's probably one of the reasons her favorability with his voters was so bad, and why Hocul was able to run her campaign comparatively unscathed.
Well, there are reasons why Republicans decided to attack the Independant, not the Democrat.
I suppose. That's assuming than the NY Republican Party had good strategist, a thing than I doubt, given their current results. They can only win seats in a outside wave context like 2010, but seems unable to win an election in normal, neutral conditions.
As which side the voters are swinging on Medicare, we will see in 2012, I suppose.