It was one of the day’s most probing questions about health care, with ramifications for the millions of Americans and the presidential campaign. But it did not come from a Supreme Court Justice. It came from the Tonight Show’s Jay Leno, and it was directed to his guest, Mitt Romney. Leno pressed Romney on some of the nuts and bolts of President Obama’s health care law - and what might happen if it is ruled unconstitutional by the Supreme Court. It’s a question that has been ricocheting across this politically-driven city. No final decision will be rendered before June, but the issue has re-emerged at the forefront of national politics and the presidential race.