In picking Ryan, Romney is, in a way, emulating the vice presidential decision made by the man who beat him for the 2008 GOP nomination: John McCain.
Ryan, like Sarah Palin, is a pick designed not necessarily to appeal to independents or Democrats, but rather to excite the party’s base. Palin’s selection did that for McCain, at least for a time, but her candidacy fizzled after a number of slip-ups, including her now-infamous interview with Katie Couric. Presumably, Ryan won’t make the same sorts of mistakes that Palin made, and it’s helpful to him that he’s much more familiar with the national press, which regards him as an intellectual. (They certainly didn’t feel that way about Palin.) Also, McCain’s base strategy couldn’t succeed in a year when the Republican Party was so damaged, when the economy was collapsing and when Barack Obama was running a historic, exciting candidacy. But a base strategy might work this year because a motivated GOP base, despite its weaknesses with minority voters, might be able to outnumber the Democratic base in this election, much like it did in 2004.
It does not appear that Romney has his base fully behind him.