Staggered Senate
Senators serve four-year terms, with one two-year term after each redistricting, so about half the seats are on the ballot each election.
Hawaii › Hawaii State Senate · November 3, 2026 · Updated Oct 16, 2026
Hawaii State Senate District 21
Mike Gabbard has no major-party opponent.
Mike Gabbard has no major-party opponent.
How this race is decided
The candidates
DemocraticIncumbent
Mike Gabbard
- Experience
- State legislature
The district
Lean R+2: how much more Democratic or Republican than the nation it votes for president.
Presidential vote
Precinct results re-aggregated to the current district lines.
Who lives here
- Population
- 59,366
- People per km²
- 646
- Adults with a B.A.+
- 28%
- White, no degree
- 8%of adults
- White 13%
- Hispanic 15%
- Black 3%
- Asian 32%
- Other / multiracial 37%
American Community Survey 2020–2024, aggregated from census tracts.
Past results
Results in the same-numbered district; earlier elections may have used different lines.
2024 President Vote in this district
19,277 two-party votes · R+4.3 · R+2.8 vs. the nation✓ Donald Trump (R)52.1%
Kamala Harris (D)47.9%
2022
13,862 votes · D+17.8✓ Mike Gabbard (D)58.9%
Matthew D Khan (R)41.1%
2020 President Vote in this district
22,262 two-party votes · D+6.3 · D+1.7 vs. the nation✓ Joe Biden (D)53.1%
Donald Trump (R)46.9%
2018 Earlier district lines
9,857 votes · D+17.8✓ Maile Shimabukuro (D)58.9%
Diamond D Garcia (R)41.1%
2016 President Vote in this district
14,002 two-party votes · D+13.0 · D+10.8 vs. the nation✓ Hillary Clinton (D)56.5%
Donald Trump (R)43.5%
2014 Earlier district lines
8,949 votes · D+35.9✓ Maile S L Shimabukuro (D)67.9%
Tercia L Ku (R)32.1%