After an exchange of gunfire on a crowded Sacramento street killed six people and wounded 12 more, Democratic politicians and others are again calling for gun control. So will there be meaningful change? Chronicle senior political writer Joe Garofoli lays out the obstacles, including opposition from Republicans in Congress who fear alienating their voters and California’s inability to keep guns from streaming in from states with weaker laws. | Unlimited Chronicle access: sfchronicle.com/pod

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