I agree. 2000 out of 10000 is 20%. I can see maybe 100 signatures being questionable, but 20%? Something stinks is right.
"Never assume conspiracy when ineptitude will do".
Making excuses for Newt you are. His signature gathering effort was a confused and dilatory, using paid shills at shopping malls and supermarkets. The successful efforts were conducted by volunteers outside polling places, which garners actual registered voters.
Newt's executive incompetence is on full display. If he can't muster the ability to get on his home State ballot he is hardly GOP nominee material.