NEW YORK (Reuters) - The euro dropped more than 1 percent to its weakest level against the dollar in seven months on Tuesday after France's rejection of the European Union constitution sparked worries about the prospects for economic reform in Europe. "The weekend 'No' vote was deemed to be negative for the euro and has sent the euro/dollar into a new trading range. It is quite possible that in the coming weeks we could get as low as $1.20 before the market decides that it has bought enough dollars for the time being," said Michael Woolfolk, senior currency strategist with...