CA-18 elected a Democrat in 2016.

D+42.3 on 323,930 certified votes. Below: the 2016 result and this district's margin across every cycle on record.

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CA-18 — 2016 result

Source: MIT Election Data + Science Lab, US House returns (party-classified by literal ballot party).

Democratic (D)

230,460

71.1%

Republican (R)

93,470

28.9%

All others

0

0.0%

Margin

D+42.3

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Margin history

CA-18 across every cycle on record. Each year links to its district page.

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Year	Won	Margin	Votes
2024	D	+29.3%	228,506
2022	D	+31.7%	151,513
2020	D	+100.0%	344,139
2018	D	+49.0%	302,238
2016	D	+42.3%	323,930
2014	D	+35.5%	196,386
2012	D	+41.0%	301,934
2010	D	+17.0%	124,569
2008	D	+100.0%	130,192
2006	D	+31.0%	108,713
2004	D	+35.0%	153,705
2002	D	+7.9%	109,593
2000	D	+35.8%	180,328
1998	D	+86.8%	136,931
1996	D	+33.9%	165,586
1994	D	+33.8%	139,054
1992	D	+84.7%	165,011
1990	D	+100.0%	98,804
1988	D	+39.9%	179,749
1986	D	+42.5%	142,387
1984	D	+34.6%	190,525
1982	D	+21.2%	155,927
1980	R	−42.1%	177,461
1978	R	−18.5%	144,563
1976	R	−28.4%	158,341