<span>South Carolina's insistence on nullifying the Tariff Act of 1832 because John Calhoun brokered a deal to lower tariffs over 10 years..</span>
May you please add what your choices are? it is a little hard to answer without any information.
The article in Politico suggests a couple of possible reasons for the celebrity involvement in the 2012 election like for one Barack Obama's star power and liberal appeal plus because of the social media boom which makes the communication much, much easier. Finally this kind of communication with the stars also works well.
