I think it would be very useful to find out if she was an intern not with the Kerry campaign, but with a newspaper or magazine as a summer intern. Particularly while she was a student at Clark University in Worchester, Mass, where Kerry maintains an office.
From a Philadelphia newspaper account, as reported by FReeper Jimbo123:
"Alexandra Polier, a tall blonde known to friends as Alex, went on from Malvern to Clark University in Worcester, Mass., where she earned a degree in 2000 with a double major in philosophy and government. She then studied journalism at the prestigious Columbia Journalism School in New York, and landed a job with the Associated Press, working for a time for the New York bureau."