DENVER—A ballot measure that would bar abortions in every circumstance and even ban emergency contraception is back before Colorado voters this fall—but the campaigns for and against it are toned down from two years ago.

That's because Colorado voters roundly rejected the measure to give citizenship rights to fertilized embryos in 2008, defeating the so-called "personhood" amendment by a 3-to-1 margin. This year, abortion opponents petitioned the idea onto ballots again in a slightly different form, and abortion-rights supporters are launching a scaled-back attack on the measure.

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