Democratic candidate Phil Angelides challenged Gov. Arnold Schwarzenegger on gun control and affirmative action Friday at the California NAACP conference, framing the issues as African American concerns the Republican governor should address when he visits the same group Saturday. The Democratic state treasurer questioned why Schwarzenegger accepted an endorsement from the California Rifle and Pistol Association "when our young men and women are being gunned down in the streets of Oakland." He also charged that Schwarzenegger never fought against a voter-approved 1996 initiative that banned colleges and other public institutions from using affirmative action. "I'm proud that I opposed Proposition...