Greenwire: With Congress and President Obama championing green energy, the solar industry sees an opening to pursue a goal it long considered unattainable: European-style subsidies for sun-generated power. The national trade group for solar manufacturers is discussing whether it should push for a national feed-in tariff, a funding mechanism that forces utilities to buy green power at premium prices. Popular in Germany and Spain, feed-in tariffs have gained little traction in the United …