Far more damage is going to be done to "American's soul" with eight years of Romney and other Democrats and weakened Republican party (which will be devastated by a Romney Presidency) than it will be by a lame-duck President and stronger Republican party (which will see a growing number of conservatives elected).
But of all the Democrats during that time, none, not Jimmy Carter and not Lyndon Johnson, represented a threat to the survival of the country.
If you can credibly assure me that the Republic will survive four more years of Obama, I will rest easy with his reelection but then in logic you must forgive me if I do not behold in terror the prospect of Romney's election.
The question is the survival of the nation, not the survival of a party that has never been pure.