Mitt Romney's wife says now is the time for Republicans to unite behind one presidential nominee.

Mitt Romney & wife Ann
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Ann Romney stood at her husband's side Sunday night at a rally in suburban Chicago and offered the campaign's most aggressive plea yet for Republicans to end their extended nomination fight. The comments came moments after Mitt Romney announced he had won all 20 of Puerto Rico's delegates in the island's Sunday primary.

Ann Romney says it's time for the GOP to come together behind one nominee so it can focus on defeating President Barack Obama in the fall.

The Romney campaign hopes Illinois will prove to be a knockout punch against rival Rick Santorum. While some conservatives don't like Romney, he has accumulated more delegates than all his competitors combined.

GOP voters' passion uneven for Romney, Santorum

Rick Santorum campaigns in Missouri
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WASHINGTON (AP) — Mitt Romney may lead in delegates and Rick Santorum might have momentum, but neither of the two leading Republican presidential candidates is having an easy time exciting even his own voters.

Out of a dozen states where voters in the GOP contest have been polled, most Romney voters say they strongly favor him in just five of them. A majority of Santorum voters felt that committed to him only four times out of 11 states where he was on the ballot and voters were surveyed.

Each man is struggling to consistently spark the intensity that could separate him from the pack.

On average, about half Romney and Santorum voters say they strongly favor their candidate. That comes from entrance and exit polls of voters in 12 states.

(Copyright 2012 by The Associated Press. All Rights Reserved.)

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