(RASMUSSENREPORTS) — With the perception growing that he will be the GOP nominee, Romney leads President Obama by five points in a hypothetical 2012 matchup. Today’s numbers show Romney at 48%, Obama at 43%. That’s Romney’s largest lead since December. Matchup results are updated daily at 9:30 a.m. Eastern.

If Santorum is the Republican nominee, he is up by one point over the president, 46% to 45%. This is the second time since polling began in 2011 that Santorum has had a slight lead over Obama. Romney is the only other candidate to lead the president more than one time in the polls. See tracking history for Obama vs. all four Republican candidates.

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