Will Limbaugh call for nullification? Probably not - he's a republican.
http://www.tomwoods.com/blog/walter-williams-calls-for-nullification-while-hosting-limbaugh/
I don't think there are any state legislatures that have the backbone for nullification. Maybe Texas or Alaska, but that is still doubtful.
Looks like Oklahoma is taking a look at nullification. Hope so.....
http://blog.tenthamendmentcenter.com/2012/07/oklahoma-state-rep-to-file-bill-to-nullify-individual-mandate/