How about we have a list of the last time a county voted the other way.
Here's California:
2004 Republican: Trinity, Butte, Nevada, San Joaquin, Stanislaus, Merced, Fresno, San Lois Obispo, Ventura, San Berdadino, Riverside, San Diego
2000 Republican: Alpine, Mono
1992 Democrat: Del Norte, Siskiyou, Tehama, Plumas, Tuolumne, Mariposa,
1988 Republican: Napa, Sacramento, Monterey, San Benito, Santa Barbara, Imperial
1984 Republican: Humbolt, Mendocino, Sonoma, Lake, Solona, Contra Costa, San Mateo, Santa Clara, Los Angeles
1980 Republican
Santa Cruz, Marin
1976 Democratic
Shasta, Lasse, Sierra, Yuba, El Dorado, Amador, Placer
1968 Democratic: Kings
1964 Democratic: Modoc, Glenn, Colusa, Calaversa, Tulare, Inyo, Kern, Yolo, Madera
1948 Republican: San Francisco, Alameda
1940 Democraic: Sutter
1936: FDR wins every county, including Orange