Re: "When you question his sanity, intelligence, morals or heritage, etc., you just turn independents off." Who cares? If they are so shallow as to make their decisions about the suitability of a person to be president on such a flimsy basis, they probably weren't going to see reason anyway. "Birther nonsense"? Au contraire - defense of the constitution is always the best course of action; your politically expedient approach is the reason the usurper got into the White House in the first place. Thanks a bunch!
The only proper course of action is this - do the right thing, everytime, without exceptions, no matter what the odds. Anything else is surrendering to the enemy. And yes, I chose that word intentionally.