Such a campaign would be a "mutual admiration society" meeting. I haven't the faintest idea where those two disagree on much of anything.
That would be an easy contest to "sit out" so as not to encourage either side.
The only difference I see between "Patches" "Don't you know who I am?!" Kennedy and Lincoln "Don't you know who I am?!" Chafee is that Chafee's IQ is slightly higher than his body temperature whereas no Kennedy since RFK can legitimately make that claim.