Super Tuesday: Mitt Romney focuses on economy, while rivals seek openings

There has been enough movement in the polls in the past 24 hours to warrant revisiting our delegate projections from Sunday.The closest that Americans get to a national presidential primary comes every four years when a large group of states hold their primaries and caucuses on the same day.AP Photo. Rivals Mitt Romney and Rick Santorum made their final pitch for support in the vital battleground state of Ohio on Monday, the day before 10 states hold Super Tuesday nominating contests that could

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