As First Lady?
What political cred does that give her?
You can't be first lady and not learn a great deal about how Washington works, and how the job of President works. Just ask Barbara Bush about what happens in the life of a President
The average joe/jane voter in America pulls the lever in the voting booth based on the mental imagery in their heads.
What many will think when Hillary crosses their minds, will not be Benghazi or emails. That will cross the minds of people who wouldn't vote for her anyway.
They will remember her in those smart outfits in the white house, Senator from New York, and photos of her looking especially haggard and tired, meeting leaders of the world.
Which Republican candidate can invoke anything like that?
Remember, 95% of voters are not political junkies like us paying close attention