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President Obama tops Republican Mitt Romney in a head-to-head matchup, according to the latest Fox News poll, which finds American voters feeling more positive about the economy.

Obama would have an advantage of 46 percent to 39 percent over Romney, if the election were held today. Three weeks ago the candidates were tied at 46 percent each.

The national poll, released Wednesday, shows the president’s lead is just outside the poll’s margin of sampling error.

Click for the full poll results

About a third of voters say they are “extremely” interested in the election. Among just that group, Romney tops Obama by 50 percent to 44 percent.

Overall, each candidate’s party support is strong: Most Democrats back Obama (88 percent) and most Republicans support Romney (84 percent).

Among independents, 34 percent back Romney, 29 percent support Obama and more than a third are undecided or say they won’t vote (36 percent). Last month, independents broke for Romney by 46 percent to 33 percent.