Theory regarding Harry Being a Horcrux

[ohneill_2001]

No: HPFGUIDX 134512

I apologize if this has already been posted; I have not found it 
anywhere, although I admit I have not entirely kept up with all of the 
discussion since HBP came out.

Anyway -- I have seen much posted regarding the possibility that the 
seventh bit of Voldemort's soul was placed inside Harry at the time of 
the failed AK, and that this will be the reason why Harry must die at 
the end of Book 7 in order to kill Voldemort.  

My question is this:  is it possible that part of Voldemort's soul 
*was* in Harry, but that Voldemort unwittingly reunited this part with 
himself when he used Harry's blood to resurrect himself in the 
graveyard in GOF?  This would explain Dumbledore's "gleam of triumph" 
at hearing that Voldemort had used Harry's blood.

Just a thought I had earlier today.  Any thoughts?

--Cory