Super Tuesday, the biggest day of the US Republican presidential battle, is just hours away, when Republican voters in ten states across the nation will make their voices heard.<br /><br />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.<br /><br />Al Jazeera's Alan Fisher reports from Boston on who's spending what to try and win.
