The beginning of the end of the 2024 presidential primaries starts Tuesday, when President Joe Biden and former President Donald Trump are expected to all but clinch a rematch of their 2020 contest eight months ahead of the November general election. There will be contests in 15 states on this year's Super Tuesday, with voters going to the polls in every time zone in the continental US, from Alaska and California to Colorado, Minnesota and North Carolina. Results from the Democratic Iowa mail-in caucus will also be reported. By the time it's done, Biden and Trump are both expected to...