A November ballot measure that would greatly expand Indian casino gambling received a boost Thursday from two taxpayer advocacy groups -- and opponents promptly countered with a taxpayer group of their own. At a Sacramento hotel news conference, leaders of the taxpayer groups said they were backing Proposition 70 because it would provide revenues for the cash-strapped state without digging to deeply into the tribes' pockets. "We think it's a good deal, a fair deal, all around," said Lewis Uhler, president of the National Tax-Limitation Committee. "The core principle of Proposition 70 is that gaming tribes will contribute to the...