It seems like we're seeing stories like these on a weekly basis here lately. From the Politico :
Fred Thompson's campaign-in-waiting suffered another departure last week, as spokeswoman Burson Snyder tendered her resignation, according to sources close to the campaign. Snyder follows a handful of other Thompson aides out the door as the organization struggles to find its footing in the run-up to the former senator's anticipated post-Labor Day launch. ...
A Tennessean and former press secretary to Thompson when he was senator, Snyder chafed, these sources say, at the uncertain lines of authority and chain of command within both the communications team and the broader campaign staff.
Again, this thing has been fairly regular in the past month. It seems as though the closer they get to the rumored launch date (which has been moved back several times), more people find a reason to leave. And while it may not be a big deal, you can't say that this sort of regular turnover in a soon-to-be-official campaign doesn't hurt. The bloom may be off the rose.