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So is there a constitutional provision that says a person convicted of a crime will not go to jail and will be pardoned to run for office and possibly even become president?
For the federal crimes Trump has been indicted on, the general assumption is that Trump will (corruptly) order the DOJ to drop those charges. Nothing even remotely like this has ever been done before in the USA, and there has always been a very strong separation between the DOJ and the rest of the government, but that wasn't true in the first Trump presidency, and most assume it will get much worse in the second if there is one.
New York is not under the jurisdiction of the US government? The president or congress has no authority or say over crimes in New York? Why did New York convict Trump but not put him in jail?
Congress can pass a law that overrides a state law if they choose to. They cannot, however, override a conviction after the fact.
New York has convicted Trump, but he has not yet been sentenced. Trump's lawyers have successfully stalled his sentencing trial, which will now occur after the election. However, Trump is broadly expected to be sentenced to several years in prison.
As to what happens when a sitting US president is sent to jail, there is no Constitutional precedent for this, and of course it has never happened. Unlike the federal crimes Trump has committed, he cannot self-pardon his way out of these (and self-pardoning itself is blatantly against the intent of the US Constitution but the Republican majority Supreme Court would probably still say it's okay).
In short, if Trump wins, the US will instantly be in a constitutional crisis as our laws will suddenly mean nothing if somebody can escape incarceration by mere popular vote. The correct thing to do will be to use the 25th Amendment to relieve Trump of his duties while he is in prison, but I suspect Republicans would rather end our 240 year Constitution instead and simply ignore the state of New York illegally.
By the way, if your country is so bad that there are no more candidates and they let a criminal run for president, I feel worried for your country.
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
Yes, this is a very bad time for the USA: roughly half of American voters want a convicted criminal as their president. The US founding fathers probably assumed voters would never ever do that. Go figure.