A state lawmaker in California is ditching the Democratic Party — after becoming the first Democrat to win her district in decades — and heading to the GOP, and revealed to a newspaper’s editorial board what she called the “last straw.” State Sen. Marie Alvarado-Gil was elected two years ago to represent the following counties: Alpine, Amador, Calaveras, El Dorado, Inyo, Madera, Mariposa, Merced, Mono, Nevada, Placer, Stanislaus and Tuolumne. Marcos Bretón, of The Sacramento Bee’s editorial board, noted that while the switch would be “notable” in other states, it’s “highly unusual” in Californ…