{"biography":"## Current office and 2026 campaign\nMatthew Chung Chieh Sin (listed on the ballot as \"Matthew Sin\") is a Republican candidate for U.S. House of Representatives, North Carolina's 10th Congressional District, according to the North Carolina State Board of Elections' 2026 candidate filing list [1]. Matthew filed for candidacy on December 4, 2025, for a multi-county district including Catawba, Forsyth, Iredell, Lincoln, and Yadkin Counties [1]. The race appeared on the March 3, 2026 primary ballot [1]. **Sin lost that primary, finishing second to Pat Harrigan: 6,509 votes (12.3%) to Harrigan's 46,270 votes (87.7%); Sin will not appear on the November 2026 general-election ballot [4].**\n\nMatthew Chung Chieh Sin and Harry Clare Morley Jr. (also profiled on this site) are both filed candidates for this same U.S. House seat, in opposing parties' primaries.\n\n## Background\nAccording to the North Carolina voter file, Matthew Chung Chieh Sin is a registered voter in Forsyth County, North Carolina, registered since 2024 (2 years), with party affiliation listed as Republican [2]. The voter file shows Matthew Chung Chieh Sin's year of birth as 1976; NC publishes only the year of birth in its bulk voter export, so day and month are not part of the public record [2]. The voter history file shows 2 elections voted in since 2024, most recently the 2026-03-03 primary [3].\n\nThis biography draws on the North Carolina State Board of Elections' candidate filing records and the state's public voter registration and history files. No additional published biographical information (news coverage, a campaign website, or a Ballotpedia profile) was located. Voters with personal knowledge of Matthew Chung Chieh Sin can reach ballotproject.org with corrections or additions.\n\n## Sources\n[1] North Carolina State Board of Elections, 2026 Candidate Filing List (bulk CSV), accessed 2026-07-21 -- https://s3.amazonaws.com/dl.ncsbe.gov/Elections/2026/Candidate%20Filing/Candidate_Listing_2026.csv\n[2] [North Carolina State Board of Elections - Voter Search](https://vt.ncsbe.gov/RegLkup/)\n[3] North Carolina State Board of Elections voter history file (`ncvhis_Statewide`), published at [dl.ncsbe.gov](https://dl.ncsbe.gov/)\n[4] North Carolina State Board of Elections, 2026 primary election results (`results_pct_20260303`), published at [dl.ncsbe.gov](https://dl.ncsbe.gov/) \u2014 accessed 2026-07-24","campaigns":[{"contest":"us_house_010","county":null,"county_count":0,"electiondate":"Tue, 03 Mar 2026 00:00:00 GMT","pgr":"general","state":"NC","title":"Us House Of Representatives District 10"}],"cf_filings":[],"firstname":"Matthew","fullname":"Matthew Chung Chieh Sin","lastname":"Sin","middlename":"Chung Chieh","office_history":[{"campaigns":[{"contest":"us_house_010","contest_title":"Us House Of Representatives District 10","county":null,"county_count":0,"electiondate":"2026-03-03","office_county":null,"office_key":"us_house","office_title":"U.S. Representative","party":"REP","pgr":"general","state":"NC"}],"county":null,"cycles":[{"general":{"contest":"us_house_010","contest_title":"Us House Of Representatives District 10","county":null,"county_count":0,"electiondate":"2026-03-03","office_county":null,"office_key":"us_house","office_title":"U.S. Representative","party":"REP","pgr":"general","state":"NC"},"party":"REP","primary":null,"term":null,"year":2026}],"office_key":"us_house","office_title":"U.S. Representative","state":"NC","terms":[]}],"summary":"Per the NC voter file: REP voter in Forsyth County since 2024.","terms":[],"token":"c9cc644421e8045c"}