Donald Trump was the runaway winner in the Indiana primary, as expected. Polls, and the demographics of the state, had suggested as much. And as usual during this election, they’ve been proven right.

Less than three weeks ago, Mr Trump’s odds had fallen to 55 per cent. Now, he is as likely to be the Republican nominee as Hillary Clinton is to be the Democratic nominee, with both a 98 per cent favourite in the betting markets.

But the question remains: will he actually become President?

Now that he’s wrapped up the nomination, his chances of being America’s next president have shot up from 17 per cent to 29 per cent.

But that still makes Hillary Clinton a 69 per cent favourite (Mr Sanders or ‘some other Republican’ both have a 1 per cent chance).

Trump has ways to catch up.

That means Ms Clinton begins this six-month race more favoured than any other candidate in modern history: more than Mr Obama ever was against John McCain in 2008 or Mitt Romney in 2012, or George Bush was against Al Gore in 2000 and John Kerry in 2004.

Ms Clinton leads Mr Trump by 7-8 points in the 40 or so hypothetical general election polls published in the past six weeks. If she won by such a margin her victory would be at least as convincing as Mr Obama's in 2008.

Donald Trump: What are his actual policies?

Yet a Donald Trump presidency is still a real possibility. A 3-in-10 chance is 1,450 times more likely than Leicester were to win the league this year - and we all know what happened there.

And those percentages will change rapidly if the national polls start to change, or if Mr Trump proves formidable in swing states like Florida – where he performed very strongly in the Republican primary – and across the ‘Rust Belt’ in places like Pennsylvania, Ohio and Michigan, where ‘white and working-class’ voters may swing behind him.

Donald Trump's most controversial quotes Show all 14 1 /14 Donald Trump's most controversial quotes Donald Trump's most controversial quotes On Isis: "Some of the candidates, they went in and didn’t know the air conditioner didn’t work and sweated like dogs, and they didn’t know the room was too big because they didn’t have anybody there. How are they going to beat ISIS?" Getty Donald Trump's most controversial quotes On immigration: "I will build a great wall — and nobody builds walls better than me, believe me —and I’ll build them very inexpensively. I will build a great, great wall on our southern border, and I will make Mexico pay for that wall. Mark my words." Reuters Donald Trump's most controversial quotes On Free Trade: "Free trade is terrible. Free trade can be wonderful if you have smart people. But we have stupid people." PAUL J. RICHARDS | AFP | Getty Images Donald Trump's most controversial quotes On Mexicans: "When Mexico sends its people, they’re not sending their best. They’re sending people that have lots of problems. They’re bringing drugs. They’re bringing crime. They’re rapists." Getty Donald Trump's most controversial quotes On China: "I just sold an apartment for $15 million to somebody from China. Am I supposed to dislike them?... I love China. The biggest bank in the world is from China. You know where their United States headquarters is located? In this building, in Trump Tower." Getty Images Donald Trump's most controversial quotes On work: "If you're interested in 'balancing' work and pleasure, stop trying to balance them. Instead make your work more pleasurable." AP Donald Trump's most controversial quotes On success: "What separates the winners from the losers is how a person reacts to each new twist of fate." Donald Trump's most controversial quotes On life: "Everything in life is luck." AFP Donald Trump's most controversial quotes On ambition: "You have to think anyway, so why not think big?" Getty Images Donald Trump's most controversial quotes On his opponents: "Bush is totally in favour of Common Core. I don't see how he can possibly get the nomination. He's weak on immigration. He's in favour of Common Core. How the hell can you vote for this guy? You just can't do it." Reuters Donald Trump's most controversial quotes On Obamacare: "You have to be hit by a tractor, literally, a tractor, to use it, because the deductibles are so high. It's virtually useless. And remember the $5 billion web site?... I have so many web sites, I have them all over the place. I hire people, they do a web site. It costs me $3." Getty Images Donald Trump's most controversial quotes On Barack Obama: "Obama is going to be out playing golf. He might be on one of my courses. I would invite him. I have the best courses in the world. I have one right next to the White House." PA Donald Trump's most controversial quotes On himself: "Love him or hate him, Trump is a man who is certain about what he wants and sets out to get it, no holds barred. Women find his power almost as much of a turn-on as his money." Getty Images Donald Trump's most controversial quotes On America: "The American Dream is dead. But if I get elected president I will bring it back bigger and better and stronger than ever before and we will make America great again." GETTY

We just don’t know yet. The next six months are set to become one of the most contentious and aggressive political campaigns in history, between two figures who have each been in the limelight for more than 40 years.

The primaries will drag on for another month (see here for an explanation of why Mr Trump has won, even though he’s still short of the 1237 delegates he needs), with California and a few other states effectively wrapping up each race on June 7.

Trump won tonight, as he did last week and the week before.

Then the race will turn quiet – in so far as a Mr Trump V Ms Clinton race ever could – until the conventions in late July, which now look increasingly unlikely to be contested.

Attention will be focused on who each candidate chooses to be their running mate, with Mr Trump purportedly short of options. Both will also try and unite their party, and ensure Mr Cruz or Mr Sanders supporters back them in the general election.

August could see fierce protests across the US as Mr Trump holds rallies that will surely be even larger and more fractious than those so far.

And in September and October the race reaches its final stretch, with three presidential debates over a fortnight (beginning on September 26).