Obama supports "Ground Zero Mosque" (of course he does)

It is clear, if the original adress by Obama was listened to, that Obama supported by his general statement the idea of a mosque beeing build on the graves of those who got killed

Thats true if you are from planet loon.

that building the mosque on the graves of the victims of 9/11 is pure mockery

It would indeed be a mockery, but as it isn't true that is an irrelevant fabrication by hatemongers.

In the past two weeks, I read in random news reports always the same number: that roughly two thirds of Americans are against this mosque

So what?

This isn't a Constitutional issue.

In the absence of any legal basis for blocking construction any other attempt to block it would be unconstitutional as it infringes on freedom of religion.
So any attempt to ban mosques from lower manhatten would fail under the constitution as it would not be deemed generally applicable unless it banned all places of worship from existing near there.