Obrador is winning by such a stupidly large amount, he literally has more votes than all the rest of the candidates combined. And let me remind you, this is in a flawed democracy/hybrid regime where he's part of the opposition. And not even the main opposition.
Not only that, but it looks like MORENA (Obrador's party) and its coalition now basically control 3/4 of the Chamber of Deputies.
He's basically winning in real life by how much Trump had to desperately claim he won.
It is not only that he won so convincingly, but also the historic nature of this win. In 2000, Vicente Fox had broken the control of the country by PRI - a political party that had been in power in Mexico for much of the 20th century. Still, Fox was simply a conservative alternative to PRI. Obrador seems to be truly of the left opposition to PRI, and much more based on leftist principles and policies. No longer can PRI credibly claim to be the party of permanent revolution.
A big challenge will be to deal with what are probably highly inflated expectations of what Obrador can accomplish. While his party now appears to have solid control of the government, there is only so much he can do in the way of economic reforms. It is highly doubtful to me that he can work miracles. So I expect at some point frustration and disillusionment will set in. To borrow a bit from anther poster of a different thread, Obrador can bring about reforms, not revolution. It is the same old problem of trying to carry out revolution in one country. Even an alliance with China will no doubt come with strings attached, and is not really something that will represent a dramatic break from the existing world order. China has simply become another capitalist country, albeit one with a strong one-party system.
So reform, but not revolution is in the cards. I doubt that this will be enough to catapult Mexico above its current problems. Still, the historic nature of this win provides a huge opportunity for at least incremental progress along reformist lines. A big challenge will be to overcome the country's culture of corruption. The art of the bribe is well developed in Mexico, and one can see great temptations to cave into that mode of operation. Yet, breaking from that mold might very well be impossible without resort to hugely repressive measures. A lot will depend on the good will of those who have been recently elected to office. Honest behavior on their part can go far to break with the old ways of operating.
This also would appear to place Mexico solidly in the column of leftist countries in Latin America. It now joins the ranks of Bolivia, Cuba, Nicaragua, and Venezuela in that regard. It bucks the trend of recent reversals in Argentina, Brazil, Chile, and Honduras. Moreover, unlike Cuba, it has achieved that status through strictly democratic means. For now, its legitimacy is far greater than Venezuela in that regard. That is a truly exciting development.