Two national polls show Obama with leads of nine and seven points. A poll in Iowa shows Romney up by a slim margin. Here's our guide to today's polls and why they matter.
Findings: Obama leads Romney by nine points in a new Fox News poll with 49 percent to Romney's 40 percent. That's up from July when he led by only four points. In a CNN/ORC International poll he leads by seven percentage points — having 52 percent to Romney's 45 percent — among registered voters. In their most recent previous poll Obama led 49 percent to 46 percent. Talking Points Memo notes that in this poll Obama had a 53 percent to 42 percent lead among independent voters, a big change from the July poll when Romney led them 49 percent to 42 percent.
Methodology: For Fox News: 930 registered voters were polled between August 5 and 7 via telephone using live interviewers. (The poll had an oversample of "115 randomly selected Hispanics.") The margin of sampling error is +/-3 percentage points. For CNN: 1,010 adults — including 911 registered voters — were interviewed via telephone August 7 through 8. The margin of sampling error for the total is +/-3 percentage points.