Summary
Four men will take the stage in Miami: Trump, Senator Rubio, Senator Ted Cruz of Texas, and Ohio Governor John Kasich.
Trump is by all accounts the man to beat.
Rubio was championed by party luminaries as the best mainstream hope of derailing Trump, but he has performed dreadfully in several recent primary contests, including those Tuesday.
Trump leads Rubio in Florida by a dramatic 43 percent to 20 percent among likely Republican primary voters, according to a Fox News poll released Wednesday.
But Kasich leads in his own state, with 34 percent support to 29 percent for Trump and 19 percent for Cruz, according to Fox.
Clinton and Sanders clashed forcefully on the debate stage in the aftermath of Sanders' stunning upset win in Michigan, with the Democratic rivals opening lines of attack on immigration.
Both said they support comprehensive immigration reform and pathways to citizenship for many of the 11 million people now living in the shadows – something opposed by all the Republican candidates, with Trump vowing to deport millions.
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