WHEN YOU GO to vote on Tuesday, you might find your polling place has moved since you last voted, thanks to new laws and court action. And if you're in a Latino area of the city, the Justice Department wants a judge to order federal observers into your polling place. The feds say they're protecting your rights; the city fears voter intimidation. At least one thing should be reassuring: City officials have figured out what caused more than 200 electronic voting machines to break down in May, and they're confident that won't happen again. Of the city's 1,681 divisions, 142...