Just as soon as these guys at the highest level in Kerry's group find out that Kerry has lied all these years about his military record in Nam, they bail. Kerry has so far overplayed this record over the years, believing that voters in the rest of the US are as stupid as they are in Mass., that there is no way he can be "honest" and not become the laughing stock of the world.
And, it is not a sure thing that Kerry will be the nominee once some of these things (there are many) start leaking. For example, why would he continue to restrict public review of his medical records? Clinton's answer was easy, STDs over the years had rendered him impotent and, therefore, Chelsea couldn't be legitimate, but Kerry's reason is not as obvious.