The single most important or most damaging thing the government could do at this point to stall the recovery would be to cancel the planned tax reductions. Business has been planning on them. The private sector has been hiring based on them. The private sector has been investing based on them. If suddenly those were repealed at this point, the impact would be to get business to shelve its plans for expansion and getting people back to work.
On November 2nd, 2010. See this statement in context.