According to Gallup, Romney slipped from 29% to 25% in Jewish support. But the two results were arrived at by different methods, and each of them, especially the last one, by questionable techniques. So, as I said, I wouldn't read any credibility into the statement that Romney is slipping.
Barring unforseen circumstances, Romney should get about 40% of the Jewish vote nationally come November.
Well, Obama is off 10% from 2008 and like you, I can’t see his numbers going anywhere but down.
There seems to be consensus that it doesn’t matter much anyway, Jews making up such a small % of voters. I guess Florida could be an exception, though.