Marco Rubio backers had been hoping after two debates in which Rubio and Ted Cruz tag-teamed Donald Trump and played rather nice together that Cruz would take a pass on campaigning in Florida in order to give Rubio a better chance of winning his first primary election. The polls, for what they are worth seem to make this feasible: [interactive polling graphic] Florida is a closed primary state which means that many of the independents and disaffected blue-collar Democrats who have helped out Trump will not be allowed to vote. And, as we saw on Super Tuesday, the polling, generally,...