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I need to list several Presidents in a sentence and I am confused about how to punctuate the sentence!

The sentence is:
Citing examples from Roosevelt's, Truman's, and Kennedy's administrations Gibbs compares previous struggles to Obama's current plight.

Is the punctuation correct? Should I have a comma after administrations?
Thanks for your help!
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It looks okay to me. Another, possibly better, way to state this is:
Citing examples from the Roosevelt, Truman, and Kennedy administrations Gibbs compares previous struggles to Obama's current plight.
Comments  
I wouldn't like to be too definite about this, but my view is that although a comma is not strictly necessary, it would improve the readability of the sentence.
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 RayH's reply was promoted to an answer.
Oh that is perfect! Thanks so much, I used it just as that!