Limbaugh instructed his listeners to vote for her.

http://www.rushlimbaugh.com/home/daily/s ite_030608/content/01125109.guest.html

Obama's outreach to rank and file Republicans is an appeal to those whose overriding interest is in seeing the best person elected President.  The appeals of the Republican mouthpieces come from those whose overriding interest is in seeing a Republican win -- regardless of who would objectively be best for the job.  Thus it is not contradictory that both appeals are going on at once.  However, it is clear that those Republicans who understand electoral strategy --and care more about their party winning than getting the best person in office -- are backing Hillary because they think they can beat her.