New Mexico Gov. Bill Richardson's strategy for winning the Democratic presidential nomination against better funded and more famous rivals includes a focus on his Hispanic roots and leadership of a Western state. That explains why he chose to officially launch his presidential campaign Monday in California, a state with newfound prominence in the 2008 campaign. Richardson is hoping changes to the primary calendar that give new clout to several states with large Hispanic populations can increase his chances of victory. Among those new powerhouses are Nevada, Florida and California, the most delegate-rich state which will hold a primary Feb. 5....