Oil retreats with rattled stocks as U.S. voting gets underway

By Amanda Cooper LONDON (Reuters) - Oil prices eased on Tuesday, paring earlier gains as voting in the U.S. presidential election got underway, in line with a retreat in U.S. stock index futures and a pickup in the dollar. In a swell of investor risk appetite, U.S. stocks racked up their biggest one-day gain since March on Monday, but this boost, which lifted oil, copper and European equities earlier on Tuesday faded. The most recent polls have put Democrat Hillary Clinton ahead of Republican ri