The reason I think there will be a challenge is that cowan is a young enough guy in political terms and another career like Berties would mean Ahern/Martin/Hanafin would never get a shot at it.
Another thing is that from there have been whispers that Cowan has been too forthright in the past 6 months to a year, there will be a lot of people who won't take well to his "gruff" ways. Ahern would be more like, ehm, Ahern, to a lot of FFer's
Bookmarks