
These days arguments in favor of the secessionist movement would include:
California's economy, one of the top ten strongest economies in the world.
California's stem cell research initiatives.
California tax payers shouldering a disproportionate tax burden for the rest of the country.
California's kind buds and killer waves.
California's relatively liberal views when compared to the growing anti-secularism in the rest of the country.
But following the American Civil War, the Supreme Court ruled in Texas v White that states do not have the right to unilaterally secede from the Union. Meaning, any future attempts to secede would either require a new Supreme Court ruling, the consent of the United States, or a successful revolution. In addition, the California Constitution does not allow the state to leave the United States; this would need to be amended by the state legislature or referendum before any attempt to secede. (thats sucks)