US election 2012: Rick Santorum's daughter 'on the road to recovery' Mr Santorum left the campaign on Sunday, just two days before the important Florida Republican primary, to be with his daughter Issabella, who was admitted to hospital over the weekend with pneumonia. Missouri, considered a crucial swing state on the November general election, has a presidential preference vote on Feb 7. Results will be used to recommend to party leaders who make the final decision on the make-up of the state Republican delegation to the nominating convention. Republicans are not bound by the results of the "beauty contest" but several Santorum supporters said a good vote for their candidate could be used as a wedge to gain delegates. The state party leadership has said that former Massachusetts Governor Romney has the edge in the Missouri delegates sweepstakes. Mr Santorum was the first of the remaining four candidates to appear in the state. "In Missouri, you have an opportunity to send a message," Santorum said, drawing a standing ovation from about 300 people in an auditorium. Another 200 enthusiasts were turned away but heard some comments from the candidate through a bullhorn before he left for another event in Nevada. Mr Santorum is trailing behind Romney and former US House of Representatives Speaker Newt Gingrich in Florida.