Top Colorado lawmakers on Wednesday gave a package of tax hikes introduced a day earlier by Gov. John Hickenlooper an uneasy reception, with members of both parties suggesting they found the proposal lacking but are uncertain of how to proceed. Hickenlooper on Tuesday took the extraordinary step of proposing two tax hikes to send an additional $110 million to public schools, thrusting school funding into the forefront of the state’s budget discussions, even as lawmakers are already embroiled in a fight over a separate tax hike to pay for roads. The Democrat is calling for a 50 percent increase in sales taxes on recreational marijuana starting July 1, which would generate an extra $42 million. He also wants to cut the senior homestead property tax exemption in half, freeing another $68 million for schools.