The Senate sided with traditional retailers and financially strapped state and local governments Monday by passing a bill that would widely subject online shopping — for many a largely tax-free frontier — to state sales taxes. The Senate passed the bill by a vote of 69 to 27, getting support from Republicans and Democrats alike. But opposition from some conservatives who view it as a tax increase will make it a tougher sell in the House. President Barack Obama has conveyed his support for the measure. Under current law, states can only require retailers to collect sales taxes if the...