Leave it to a Gadfly.
USA Today/Gallup Poll shows that Romney may in fact be down to zero percent.
Romney's support drops to within the margin of error of not existing (that's 3% support in a poll where the margin of error is 3%).
Some public defections are posted here - with some fresh news from New Hampshire:
Meanwhile, NewHampshireforRomney.com is desperately seeking bloggers — after the three they had lost interest — and hasn't been updated, apparently, since January 30, 2007.