WASHINGTON — President Joe Biden was sweeping every Democratic contest on Super Tuesday — except for American Samoa.He fell short there to a previously unknown candidate named Jason Palmer. Out of 91 ballots cast in the territory’s caucus, Palmer won 51 and Biden won 40, according to the local party.“I found out that I had won because my phone started blowing up with friends and campaign staffers texting me,” Palmer said in an interview late Tuesday.Palmer, 52, said he never visited the…