Factbox: When key U.S. states have to finalise election tallies

FILE PHOTO: Election staff work in the Clark County Election Center in North Las Vegas, Nevada, U.S. November 6, 2020. REUTERS/Steve Marcus/File Photo

(Reuters) - The normally little-noticed process by which individual states certify the results of U.S. elections is receiving extra attention this year as outgoing President Donald Trump tries to overturn President-elect Joe Biden's victory.

Below are key dates by which states that were important in Democrat Biden's victory must certify totals from the Nov. 3 vote and pick electors who will formally vote for Biden next month in the Electoral College: