 The margin of error in that new poll is plus or minus four percentage points. An important heads up if you're planning to be driving around D.C. this week, getting around the city will be even tougher, as the district is hosting the NATO Summit for the first time in 25 years. The gathering starts tomorrow. Some road closures and other security measures are already going into place today. WTOP's Neil Augenstein was along 15th Street NW by the White House earlier.