Rick Santorum, addressing supporters and flanked by his family, exits the Republican candidacy race.
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Rick Santorum exits Republican race

11 April 2012 Last updated at 00:09 BST

For months, Republicans have engaged in a bruising fight to become their party's candidate to unseat Barack Obama in November.

But on Tuesday the field shrank with the sudden exit of Rick Santorum.

The former senator had become the most viable opponent to Mitt Romney.

Steve Kingstone reports.