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Super Tuesday, the biggest day of the US Republican presidential battle, is just hours away, when Republican voters in 10 states across the nation will make their voices heard.

Former Massachusetts governor Mitt Romney and former Pennsylvania Senator Rick Santorum are locked in a fierce battle for Ohio's 66 delegates and the momentum that a win here could bring their campaigns.

Alan Fisher reports from Boston on who is spending what to try and win.

Source: Al Jazeera