In Virginia, the former secretary of state leads the real estate magnate by 46 percent to 33 percent, widening her 9 point pre-convention lead. Clinton strengthened her position in the state by selecting Virginia Sen. Tim Kaine as her running mate.
In North Carolina, an increasingly diverse state that Obama carried in 2008 but lost in 2012, Clinton leads by 48 percent to 39 percent, widening her 6-point pre-convention lead.
And in Florida — a critical swing state in recent elections — Clinton leads by 44 percent to 39 percent. That represents a narrowing of the 7-point lead she held before the two conventions.
All four telephone surveys were conducted Aug. 4-10. The margin of error for the Colorado, Florida and Virginia surveys is 3.3 percentage points; for North Carolina, it is 3.2 points.
These surveys follow NBC/WSJ/Marist polls earlier this week showing Clinton leading in Iowa, Ohio and Pennsylvania. In the most recent NBC/WSJ national survey, Clinton led by 9 percentage points.