New polls give President Obama narrow leads in three states that may well decide the 2012 election: Ohio, Florida, and Virginia.

Obama leads Mitt Romney in Ohio by 48%-42%, according to the NBC News/Marist Poll; no Republican has ever won the presidency without carrying Ohio.

In Florida,Obama has a 48%-44% lead over Romney, says the Marist poll. Florida is another classic swing state, and decided the 2000 race between George W. Bush and Al Gore.

(Remember, polls are polls however: A recent survey by Quinnipiac University gave Romney a six-point lead in Florida; the Republican/Democratic makeup of the polling sample accounts for many of the differences.)

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