He has also focused on the white working-class voters who have moved increasingly to the Republican column in recent decades as their economic fortunes have stagnated.

"This campaign is about the towns that have been left behind," he said.

Santorum's understaffed campaign also missed opportunities to qualify for delegates in Virginia and portions of Ohio. Romney and his allies outspent Santorum by nearly 4 to 1 in Ohio.

Gingrich's strategy of focusing on southern states did not pay off in Tennessee and Oklahoma, where he came in third.

Ron Paul, a US representative from Texas known for his libertarian views, had hoped to score his first win in Alaska, but came in a distant second behind Romney.

In recent presidential campaigns, the Super Tuesday wave of primaries and caucuses has often settled the Republican race. But this year's campaign is likely to stretch until April or May - or possibly until the last contest on June 26 - under new rules designed to attract more voters and boost enthusiasm.

The Republican contenders are viewed less favorably among voters at large than the eventual nominees in earlier contests.

Questions:

1. Who won the most votes in Ohio?

2. What is Super Tuesday?

3. How many states did Romney win?

Answers:

1. Mitt Romney.

2. Republican presidential nominating contest's biggest night.

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