As of 2006, Republicans had 48 percent of voter registrations, Democrats had 30 percent, and Libertarians had roughly 5 percent.[5] A Democratic congressional candidate nearly won the district in 2008, losing by only half a percentage point and less than 1,600 votes, indicating that the district was much more competitive than it appeared to be. But in the more recent 2018 and 2020 elections the Republican candidate won over 53% of the vote.[6]
New district boundaries for the 2012 elections shifted the population center to the south and east. Registered Democrats and Independents/Decline to State voters in the new district area outnumber registered Republicans by 12%. However, Republicans, Independents/Decline to State, and small third parties outnumber Democrats well over a 2 to 1 ratio. There are 183,800 Republicans, 117,300 Democrats, and 97,200 others.[7] In presidential elections, Donald Trump won the district in 2016 with 54% of the vote and won in 2020 with 53.7% of the vote.
In the 2020 redistricting, the district was shifted again to the San Francisco Bay Area. It includes all of Lake County and Napa County, most of Yolo County, and parts of Solano County and Sonoma County. Major cities in the district include Davis, Woodland, Napa, Vacaville, and most of Santa Rosa. The new 4th district is solidly Democratic, and is represented by Mike Thompson.[1] The Solano County portion including Vacaville and Dixon have consistently been more conservative as evidenced by the 2022 midterms, voters in Congressional District 4 favored the Republican candidate 50.3% to 49.7%.[8]
As of 2023, California's 4th congressional district is located in the Sacramento Valley. It encompasses Lake, Napa, and Yolo Counties, and parts of Sonoma and Solano Counties.
Sonoma County is split between this district and the 2nd district. They are partitioned by Petaluma River, Highway 116, Redwood Highway, Robber Rd, Petersen Rd, Llano Rd, S Wright Rd, W College Ave, Jennings Ave, Administration Dr, Bicentennial Way, Cleveland Ave, Old Redwood Highway, Cross Creek Rd, Sonoma Highway, and Sonoma Creek. The 4th district takes in the cities of Santa Rosa, Rohnert Park, Sonoma, and Cotati, the town of Windsor, and the census-designated places of Boyes Hot Spring, Roseland, El Verano, Penngrove.
Solano County is split between this district and the 8th district. They are partitioned by Soda Springs Rd, Union Pacific, Alamo Dr, Leisure Town Rd, Hawkins Rd, Bay Area Exxextric, Shilo Rd, Collinsville Rd, and Montezuma Slough. The 4th district takes in the city of Vacaville, Dixon, Rio Vista, and the census-designated place of Hartley.
In 2018, six Democratic candidates filed statements of candidacy with the Federal Election Commission (FEC).[72] They were, in alphabetical order by last name: Regina Bateson; Roza Calderon; Richard Martin; Robert Lawton; Jessica Morse; and Rochelle Wilcox. Martin and Wilcox[73] dropped out of the race, with Wilcox[74] endorsing Morse in February.
Retired Air Force Lieutenant Colonel Charlie Brown, who was the Democratic nominee for this seat in 2006 and 2008, was "seriously considering" running in 2018,[75] but decided in June 2017 against a third campaign. In January 2018, Brown endorsed Morse for the nomination.[76] Bob Derlet,[77] the Democratic nominee in 2016, also endorsed Morse in January.
On the Republican side, McClintock has one challenger, Mitchell Kendrick White, who filed with the FEC in January.[78]
In February, the California Democratic Party (CDP) endorsed[79] Jessica Morse in a contested Democratic Nomination. Roza Calderon was able to successfully collect 322 CDP-credentialed delegate signatures needed to block the endorsement, in which Morse only received 44 delegate votes. However, CDP staff refused to accept the forms after it was alleged they closed doors early to prevent the submission. A petition was later filed with the Compliance Review Commission (CRC)[80] by Calderon. The CRC voted to accept and count the signatures, ultimately disqualifying enough signatures to proceed with Morse's endorsement. California allows candidates to include their professional description under their names on the ballot. Regina Bateson later challenged Morse's ballot designation title of "National Security Fellow" at the Sacramento Superior Court after months of controversy that Morse, who had not worked in three years, was "fluffing" her credentials.[81] California's Secretary of State, Alex Padilla, had struck down Morse's 3 ballot designations before Judge Gevercer ruled[82] that she presented "no credible evidence" to use the ballot designation of "National Security Fellow". Instead, he held that this title would mislead the average person about her recent activities. In the official Certified Candidate List,[83] Morse's ballot designation was left blank.
Under the California jungle primary (aka nonpartisan blanket primary) system, only the two candidates with the most votes on June 5, regardless of party, went on to the general election on November 6. Both Republicans and four Democrats appeared on the jungle primary ballot.[79] Morse finished second in the nonpartisan blanket primary in June 2018.
Morse was denied "National Security" as her ballot designation[84] for the November ballot. In the November general election, McClintock held the district with an advantage of more than eight points.[85]
^"2022 Cook PVI: District Map and List". Cook Political Report. July 12, 2022. Retrieved January 10, 2023.
^"Maps: Final Congressional Districts". Citizens Redistricting Commission. Archived from the original on March 10, 2013. Retrieved February 24, 2013.
^"Editorial: 4th Congressional District", The Sacramento Bee, May 10, 2006
^California's 4th Congressional District Ballotpedia.
^"2018 California's 4th Congressional District election". Ballotpedia. Retrieved March 3, 2019.
^"Solano County - NOVEMBER 8, 2022 - Election Results".
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^ ab"Election Results - November 4, 2008 - California Secretary of State". Archived from the original on November 26, 2008. Retrieved November 30, 2008.
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^"Rochelle Wilcox". Rochelle Wilcox. Archived from the original on January 19, 2018. Retrieved January 25, 2018.
^@Morse4America https://twitter.com/Morse4America/status/969295288740470785. Archived from the original on May 7, 2018. Retrieved January 12, 2018. {{cite web}}: Missing or empty |title= (help)
^Johnson, Doug (April 8, 2017). "Although Tough on Trump, McClintock Faces Backlash at Another Town Hall". KTXL. Archived from the original on April 11, 2017. Retrieved April 10, 2017.
^"I am thrilled & grateful to be endorsed by Charlie Brown, 2006 & 2008 Congressional Candidate for #CA04. From Charlie: "Jessica has the knowledge & experience to best represent the people in the 4th Congressional District." To read his full statement". Archived from the original on May 7, 2018.
^Morse, Jessica (January 11, 2018). "We are so grateful to have the support of community leaders, such as Dr. Bob Derlet - the 2016 Democratic candidate for #CA04! "I am behind Jessica because she is a fighter. She will stand up for the people of this district & not back down." Thank you, Dr. Derlet! #JessWeCanpic.twitter.com/e5tv0OC6bk". @Morse4America. Archived from the original on May 7, 2018. Retrieved January 12, 2018.
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