This was a confusing interview. At first she said that Mittens was an excellent candidate, and then says that she’s not convinced that he is a conservative. So.....?
That’s easy, she meant he was an excellent candidate, but out of politeness she omitted the end of the sentence...for the Democrat party.
He is. Call Central Casting and ask for "generic Republican candiate" and the casting call will be for a Mitt Romney type.
Same as Baraq Obama is an excellent candidiate.