Early voting for the November 3 US presidential election has begun in the crucial battleground state of Florida, as a record 28 million Americans have already cast ballots with barely two weeks remaining in the campaign.<br />'' <br />''<span style="color: #222222;">Florida is widely seen as a must-win for President Donald Trump, whose path to victory becomes razor-thin if he loses the southern state. Meanwhile, Joe Biden and Trump would be debating for a final time on Thursday in Nashville, Tennessee.</span><br />