Yes it has already been done to the chain so the exploit is in the wild as they say and running free.
Solidcoin is starting to remind me of Veridian Dynamics.
"Centralization and Taxes are best for security, and for you. Even if they aren't."
"Bitcoin wants you to live in terror of being attacked. Here at Solidcoin, we garauntee attack. So you don't have to live in fear anymore. Unprecedented approaches to lifes biggest problems"
"Some might say peer-review is the best way to improve ideas. Those people haven't met Realsolid. How do we know? Because fuck you"
"The worst threat to Solidcoin is FUD. Thats why we make an attempt to silence anyone who disagrees with us. You call it censorship, we call it security.