Iowa voters favor a Republican candidate over a Democrat in 3 of 4 congressional districts

Likely voters in Iowa were asked: "If the elections for the U.S. House of Representatives were being held today, which party's candidate would you vote for in your congressional district? If not sure, which way are you leaning?"

SOURCE Iowa Poll of 640 likely voters, Feb. 25-28. Margin of error: plus or minus 3.9 percentage points. Results based on smaller samples of respondents — such as congressional districts — have a larger margin of error.