Benefits of Some of these:
Luis Fortuno - Will help appeal to the growing Hispanic vote plus he's a consistent conservative who has had much success with free market reforms in puerto rico. May turn some border states into swing states, and turn some swing states red.
Nikki Haley - She's popular with Conservatives, a female and minority which will help with attempts to paint Ron Paul racist when the newsletter inevitably come up
Gary Johnson - Can win Ron Paul New Mexico and maybe even help in some of the swing states although can weaken some of the red states
Rand Paul - Rand Paul is a great campaigner and great aframing the message, and the son/father narrative is too compelling to not get major media attention.
Jon Huntsmans - former employee to Obama and anti-afghan war will bring in more of the center aside from the massive amount Ron Paul already appeals, and you get the machinery of the Mormon church on our side which bring with it lots of campaign money. Don't forget Huntsmans personal wealth.
Fred Karger - He'd turn a lot of the progressives who care more about social issues against Obama since they are tired Obama's "evolving" regarding gay rights.
Barry Goldwater Jr. - adds nothing to the ticket, but symbolically a great story
Mike Pence - he'd kill some of the center left vote, but he bring the Evangelical Money and Organization along with him that make people like him and mike huckabee effective.