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It's another important week in the US Presidential race.
Two of the biggest states to vote to so far in the Republican and Democratic primary contests are up for grabs on Tuesday.
On the Democratic side, Hillary Clinton is expected to do well in both Ohio and Florida.
On the Republican side, John Kasich is looking to chalk up his first win in Ohio. And in Florida, Senator Marco Rubio is hoping to salvage his campaign by upsetting favorite Donald Trump.
Our US correspondent Lorna Shaddick reports.
It's another important week in the US Presidential race.
Two of the biggest states to vote to so far in the Republican and Democratic primary contests are up for grabs on Tuesday.
On the Democratic side, Hillary Clinton is expected to do well in both Ohio and Florida.
On the Republican side, John Kasich is looking to chalk up his first win in Ohio. And in Florida, Senator Marco Rubio is hoping to salvage his campaign by upsetting favorite Donald Trump.
Our US correspondent Lorna Shaddick reports.
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UPSOT- RUBIO GREETS SUPPORTS IN SANFORD, FL
Greeting Florida supporters, Marco Rubio is counting on his these voters in his home-state to turn out at the polls.
SOT- Eddie Alfonso - Rubio supporter
"He's got this magnetism to him. He draws me to him. When he speaks, when he articulates his positions I just feel he could be the face of America."
UPSOT: "I love all the young voters here…"
Rubio's campaign is targeting young and Latino voters - his supporters and donors are pouring money into backing his challenge in this diverse state.
The winner in Florida will take all of Florida's 99 Republican convention delegates. Aubrey Jewett is a Political Science Professor, at the University of Central Florida.
SOT - Aubrey Jewett - Political Science Professor, University of Central Florida
"I think if Marco Rubio can't win Florida then he has no viable path to election"
But Rubio's campaign is trailing Donald Trump badly on his home turf, even as Rubio lashes out at the chaos seen at recent Trump rallies. Aubrey Jewett again.
SOT - Aubrey Jewett - Political Science Professor, University of Central Florida
"You would think that Marco Rubio, being a Senator from Florida, would be in the lead Florida, but he is not. In fact, Donald Trump, like in so many states, is in the lead and so polls have him up as many as 10, 15, 20 points over Rubio."
Rubio's campaign has been battered by claims he rarely shows up to work in the Senate - and that he abandoned many of his conservative stances after being swept into office on a wave of tea party support in 2010.
UPSOT - TRUMP ON THE STUMP - "We're going to be spending a lot of time in Florida…"
Donald Trump - who owns several properties in Florida and calls it his second home - has been merciless in his attacks on Rubio, often calling him "little Marco."
UPSOT TRUMP AT MAR-A-LAGO, PALM BEACH, FL
"He's a lightweight, we know that…"
Trump's staying power in Florida, and also in Ohio - the other big winner-take-all state to vote on Tuesday - has alarmed the Republican establishment.
But it doesn't surprise Scott Miller - the owner of a Florida company that makes conservative themed T-shirts.
SOT - Scott Miller - Owner, My Liberty Threads
"I've been taking a poll at all the fares and festivals I sell at, so for the last eight weeks or so I've been polling every single festival - county fare, biker rally - throughout Florida… and Trump has won each one of them hands down."
But Trump's lead in Ohio over John Kasich has narrowed in recent weeks. It's now within the margin of error.
Ted Cruz who's running second in the overall delegate count is also campaigning.
Some Republican leaders are urging voters to back Cruz in voting this week, instead of Rubio or Kasich. Manny Roman is Vice Chairman, Republican Party of Miami Dade
SOT - Manny Roman - Vice Chairman, Republican Party of Miami Dade
"We want to stop Donald Trump. But the way we do that is to coalesce around one person. And the only person who mathematically still has a chance to stop Donald Trump is Ted Cruz."
Meanwhile, Democrats will also go to the polls in Florida on Tuesday. Hillary Clinton leads by a wide margin in the Sunshine State. The most recent polls show the former Secretary of State with a lead of more than 30 points over Bernie Sanders. Lorna Shaddick, New York.
SOT - Scott Miller - Owner, My Liberty Threads
"I've been taking a poll at all the fares and festivals I sell at, so for the last eight weeks or so I've been polling every single festival - county fare, biker rally - throughout Florida… and Trump has won each one of them hands down."
But Trump's lead in Ohio over John Kasich has narrowed in recent weeks. It's now within the margin of error.
Ted Cruz who's running second in the overall delegate count is also campaigning.
Some Republican leaders are urging voters to back Cruz in voting this week, instead of Rubio or Kasich. Manny Roman is Vice Chairman, Republican Party of Miami Dade
SOT - Manny Roman - Vice Chairman, Republican Party of Miami Dade
"We want to stop Donald Trump. But the way we do that is to coalesce around one person. And the only person who mathematically still has a chance to stop Donald Trump is Ted Cruz."
Meanwhile, Democrats will also go to the polls in Florida on Tuesday. Hillary Clinton leads by a wide margin in the Sunshine State. The most recent polls show the former Secretary of State with a lead of more than 30 points over Bernie Sanders. Lorna Shaddick, New York.