How much damage can a first term Romney do, compared with a lame duck Obama?
Much more..take the SC. If O is reelected he may get to replace one liberal Ginsburg, with a liberal.
If Romney is elected he will likely get to replace Scalia and Kennedy with liberals.
The slightly conservative SC will be liberal for the next 25-30 years as the result of Romneys picks...the damage Romney can do is far greater than a lame duck Obama.