President Joe Biden and former President Donald Trump are poised to move much closer to winning their party's nominations during the biggest day of the primary campaign on Tuesday, setting up a historic rematch that many voters would rather not endure. Super Tuesday elections are being held in 16 states and one territory — from Alaska and California to Vermont and Virginia. Hundreds of delegates are at stake, the biggest haul for either party on any single day. While much of the focus is on the presidential race, there are also important down-ballot contests. California voters will choose candidates who will compete to fill the Senate seat long held by Dianne Feinstein. The governor’s race will take shape in North Carolina, a state that both parties are fiercely contesting ahead of November. And in Los Angeles, a progressive prosecutor is attempting to fend off an intense reelection challenge in a race that could serve as a barometer of the politics of crime. But the premier races center on Biden and Trump. And in a dramatic departure from past Super Tuesdays, both the Democratic and Republican contests are effectively sealed this year. Read more: https://www.9news.com/article/news/nation-world/super-tuesday-voting-begins/507-bb69edf6-2ca8-4330-b49d-9c72f2c64cad More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: http://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.