Mitt Romney leads Barack Obama by four points according to Rasmussen's latest daily tracking poll, released Sunday. Forty-eight percent of likely voters support Romney, with 44 percent supporting Obama. This shows a six-point swing for Romney from last week's Rasmussen poll, when the Republican trailed the Democratic president by two points.

Gallup also released a poll on Sunday, showing Obama leading Romney by one point. The Gallup poll reflects a seven-day average, while the Rasmussen poll shows a three-day average.

The RealClearPolitics average shows the two candidates are effectively tied with two months remaining in the campaign.

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