I wonder if, as someone who sympathizes with the Sanders campaign, a foreign citizen who is not a US resident, could legally get involved in this.
I would, most definitely, not want to create any legal problems to the campaign.
I would, most definitely, not want to create any legal problems to the campaign.
> The Commission has concluded herein that because uncompensated volunteer services are not considered to be a contribution under the Act, any individual, including a foreign national, may volunteer his or her uncompensated services to a candidate without making a contribution to that candidate.
From the PDF linked from here: http://www.fec.gov/pages/brochures/foreign.shtml#Volunteer
Whether the Sanders campaign actually wants foreign volunteers is a different issue.