Santorum sweeps Kansas caucuses

Rick Santorum has won a convincing victory in Kansas on Saturday in the latest stage in the race to become the US Republican presidential candidate.
Santorum was expected to do well in the strongly conservative state, where rivals Mitt Romney and Newt Gingrich did not campaign.
He needed to do well in Kansas to keep alive his hopes of winning the ticket.
Meanwhile, Romney claimed victory in Wyoming, Guam, the Northern Mariana Islands and the US Virgin Islands.
Santorum was under pressure to catch up on Romney since trailing him on Super Tuesday.
Romney won the lion's share of the 10 contests on Tuesday, taking the crucial swing state of Ohio by a narrow margin and racking up five other victories.