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Supporters hold signs for Republican candidates in front of polling precinct for the Florida Primary on March 15, 2016 in Miami, Florida. 
Voters began going to the polls Tuesday in five make-or-break presidential nominating contests, with Republican Donald Trump and Democrat Hillary Clinton seeking to tighten their grip as their party's front runners. / AFP / RHONA WISE        (Photo credit should read RHONA WISE/AFP/Getty Images)
Supporters hold signs for Republican candidates in front of polling precinct for the Florida Primary on March 15, 2016 in Miami, Florida. 
Voters began going to the polls Tuesday in five make-or-break presidential nominating contests, with Republican Donald Trump and Democrat Hillary Clinton seeking to tighten their grip as their party's front runners. / AFP / RHONA WISE        (Photo credit should read RHONA WISE/AFP/Getty Images)

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Last chance to 'Stop Trump' on Super Tuesday 3

Donald Trump looks to land the knockout blow, as Marco Rubio and John Kasich hope for home field advantage in Florida and Ohio.