I think it's her......
I can also think of many reasons why Ms Polier would deny these claims.
1) Getting 'lewinsky-ized'---Not a good prospect for somebody who is intent on having a career in serious journalism.
2) Getting 'Fosterized'---speaks for itself.
3) Back to point one---Her career in journalism is dead if she is linked romantically to Kerry. Credibility in reporting is nil.
4) To confess would be literally making a confession to her fiance that she and Kerry were lovers.....and if she were his fiancee at the time, and she cares for him, she's in deep with him.
Yep ! It will be interesting to see how this pans out ...