2

It looks like the answer is no (at least from within Gmail).

3

Using Google Contacts Preview

  1. Go to http://contacts.google.com/preview.
  2. Click on Circles.
  3. Click on the circle you want to send the email.
  4. Click on the envelope icon on the top of the circle members list.
  5. A compose email window will show up with all the circle members in the TO field.

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