Colorado’s Proposition 103, the biggest tax-increase proposal of the off-year November election, was headed to a sound defeat early Wednesday, an indication that voters still expect government to solve its economic woes with spending cuts instead of revenue increases. The measure, which would have raised state sales and income taxes to fund education, was losing by a margin of 65 percent to 35 percent with 59 percent of precincts reporting. The vote on Proposition 103 was being monitored closely nationwide as activists in other states contemplate their own tax-hike initiatives. Efforts to place tax increases on the 2012 ballot are...