Why it matters and what to watch [Video]

The biggest day of this year’s primary campaign has arrived as 16 states vote in contests known as Super Tuesday.The elections are a crucial moment for President Joe Biden and Donald Trump, who are the overwhelming front-runners for the Democratic and Republican presidential nominations, respectively. As the day with the most delegates up for stake, strong performances by Biden and Trump would move them much closer to becoming their party’s nominee.The contest unfolds from Alaska and California to Virginia and Vermont. And while most of the attention will be on the presidential contest, there are other important elections on Tuesday.Some things to watch:Does Trump keep rolling?So far, the Republican presidential primary has been a snoozer.The former president has dominated the race and his last major rival in the race, his onetime U.N. Ambassador Nikki Haley, is struggling to keep up. She lost the Feb. 27 primary in Michigan by more …