http://thehill.com/homenews/campaign/228237-team-romney-begins-vetting-his-veep-picksSo who has been contacted by the Romney campaign on this? Thune says that he has *not* been contacted by the Romney people. Portman, Rubio, and Ryan refuse to say whether they've been asked for information by the Romney campaign vetters. Pawlenty, who'd previously said he doesn't want the job, also won't say if he's been contacted:
http://abcnews.go.com/blogs/politics/2012/05/tim-pawlenty-now-mum-on-vp-prospects/Finally, the blog "The Race 4 2012" claims to have a source with knowledge of the vetting process, and said the following:
http://race42012.com/2012/05/19/the-race-4-2012-rumor-mill-special-weekend-veep-edition/Of course, this is just a blog, and presumably doesn't have the same kind of reporting standards as the NYT or WaPo, so it's worth being skeptical. But it is a somewhat established blog that's been reporting on the race for years.
And even if it's true, it doesn't mean that there aren't additional names to the ones listed above. In 2008, I think each campaign vetted about a dozen people or so, if not more.