Nearly nine out of 10 voters say the economy will be "extremely" or "very" important to their vote for Congress in the midterm elections, a good sign for Republicans who have slight advantage over Democrats on the issue, a new Gallup poll shows.

Forty-eight percent of voters say they think Republicans in Congress would do a better job of dealing with the economy, while 43 percent favor Democrats. Eighty-nine percent of voters say the economy will be "extremely" or "very" important in their midterm vote for Congress.

The four next important issues to voters are the federal budget deficit, taxes, the federal health care law and income inequality, according to the survey. Voters trust Democrats more on health-care (51-43) and income inequality (50-40), while Republicans have the advantage on the deficit (52-38) and taxes (48-43).