Florida has more senior citizens than any other US state, with around 20 percent aged 65 and over. And they love to vote: 72 percent cast votes in the 2012 presidential election.

As Florida prepares to vote, campaigns are turning their attention to senior citizens and their concerns. This Tuesday's primary awards all delegates to a single candidate, meaning the Sunshine State could either make a Trump nomination all but inevitable, or put the brakes on his momentum.