WASHINGTON (Reuters) - The Supreme Court is set on Wednesday to consider a dispute involving whether “electors” in the complex Electoral College system that decides the winner of U.S. presidential elections are free to disregard laws directing them to back the candidate who prevails in their state’s popular vote. If enough electors do so, it could upend an election. The nine justices will hear two closely watched cases - one from Colorado and one from Washington state - less than six months before the Nov. 3 election in which presumptive Democratic nominee Joe Biden challenges Republican President Donald Trump. The...