[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/POLITICS/07/12/health.care/art.capitollight.gi.jpg caption="With a year to go before midterm congressional elections, a new national poll suggests that Republicans are making gains."]WASHINGTON (CNN) - With a year to go before midterm congressional elections, a new national poll suggests that Republicans are making gains but that Americans are divided over whether they'd vote for the Democratic or Republican candidate in their district.
According to a Gallup survey released Wednesday morning, 48 percent of registered voters questioned answered that they would vote for the Republican candidate if the 2010 election for the House was held today, while 44 percent said they would back the Democrat in the race. The GOP's 4 point advantage is within the poll's sampling error.
The Republican Party's lead is a switch from a Gallup poll released a month ago, when 46 percent said they'd back a Democrat, a two point advantage over the GOP. Republicans trailed the Democrats by 6 points when Gallup questioned Americans in July.
A CNN/Opinion Research Corporation survey released last week indicated that 50 percent of registered voters would vote for the Democratic candidate, with 44 percent saying they would back the Republican candidate. The 6-point advantage for the Democrats was within that poll's sampling error.
Other polls conducted over the past two months also suggest a division among Americans when it comes to the generic ballot question, which asks a respondent if they would vote for a Democrat or Republican in their congressional district without naming any specific candidates.
According to the Gallup poll, Democrats said overwhelmingly they would vote for a Democratic candidate, while Republican voters said they would overwhelmingly back the GOP candidate. Independents broke 52 percent to 30 percent for the Republicans. That 22 point advantage for the GOP among Independents is up from a 9 point margin last month.
Next November, all 435 seats in the House and more than a third of the Senate seats are up for grabs. Democrats currently hold a 258-177 advantage in the House, and a 20 seat margin in the Senate.
"When Democratic and Republican candidates for U.S. House square off a year from now, they may face a very different electorate than the one that put Barack Obama in power a year ago," says CNN Polling Director Keating Holland. "In 2008, Democratic voters were generally more enthusiastic about voting than Republicans; now it's the GOP's turn to benefit from an enthusiasm gap."
The Gallup poll was conducted by telephone from November 5-8, with the 894 registered voters questioned mostly before the House health care reform vote on November 7. The survey's overall sampling error is plus or minus 4 percentage points.
Follow Paul Steinhauser on Twitter: @psteinhausercnn