The seismic shift of power to Democrats in Congress gives a jolt of energy to issues crucial to the Bay Area, from immigration to investment in research and other tech priorities, according to advocates, analysts and House members. Lezlee Westine, president of Tech Net, a political network of technology company CEOs in Washington, said she was hopeful that renewal of the tax credit and more H-1B visas for tech workers would be approved in the lame-duck session of Congress.