CNN reports another high-ranking GOP staffer is joining Romney's team:

Kevin Madden, press secretary for House Majority Leader John Boehner (R-Ohio), is leaving Capitol Hill to join Massachusetts Gov. Mitt Romney's (R) exploratory committee for a 2008 presidential bid.

I haven't even heard that Romney has announced an exploratory committee, so either CNN has some inside info, or they are making an assumption, though a relatively safe one.