It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt. ~ Mark TwainHe's Dumb. Romney met will Labour Party leader Ed Miliband but forgot his name and in failed fill-in-the-blank form, addressed him as "Mr. Leader." Even Sarah Palin was smart enough to write crib notes on her palm.
He's Ignorant. This is different than dumb. One can be ignorant yet smart or dumb but well informed. Romney is ignorant and dumb. He keeps referring to the United Kingdom as "England." That is like calling the United States "California." England is part of the UK, but so is Scotland, Northern Ireland, and Wales. Romney unnecessarily, and ignorantly, insulted much of the country.
He's Arrogant. It takes a special kind of hubris to think you can fly into a country and fix problems with a wave of your hand. Yet, that is want Romney did with his critique of London's Olympics preparation. This trait comes from Romney's Bain Capital days when he would take over a company, flit in for a quick makeover, and leave. If the company succeeded Romney would take all the credit, if it failed he would blame everyone else.
And this doesn't even get into the Anglo-Saxon kerfuffle or his repeated need to grovel apologies. These are not rookie mistakes. Romney has been running for President for six years now, he should have learned the necessary lessons by now. Ignorant, dumb, and arrogant is the best Mitt Romney can be.