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Why electoral votes don't match across different media outlets

KING 5 will call races based on NBC News projections as well as local election return data that shows a trailing candidate cannot overcome a deficit to win.

As America anxiously watches votes be counted in the presidential race, you may notice Electoral College vote totals vary across different networks or platforms.

There's an explanation as to why. 

At KING 5, we use NBC News as a guiding source to call national races, or declare winners, because we are the Seattle-based NBC News affiliate. However, we also get our national election data from The Associated Press, which feeds into maps that display on air and online.

For local races, KING 5 uses a combination of data from the Washington Secretary of State's Office, county elections offices and AP.

RELATED: How KING 5 will declare winners in the 2020 election

Both AP and NBC News have processes in place to handle the influx of votes, counts and results. But those processes can also lead to different judgment calls, which may cause a discrepancy in things like timing of vote counts.

For example, AP declared late Tuesday night that Joe Biden had won Arizona, giving him an additional 11 electoral votes. However, NBC News still has not called that race.

RELATED: EXPLAINER: Why AP called Arizona for Joe Biden

Below is a detailed breakdown as to how each outlet makes their calls.

The Associated Press

The Electoral College totals you see here are populated by The Associated Press. 

The AP counts the nation's vote in real-time and reports the results of presidential, congressional and state elections. It uses that vote count to declare winners in some 7,000 races.

To do so, AP uses a 50-state network of local stringers who David Scott, a deputy managing editor who helps oversee AP's coverage of elections, said collect votes at a local level, while other AP journalists gather results from state or county websites, as well as via electronic data feeds from states.

RELATED: How The Associated Press counts votes and calls races

That vote count is then transmitted to AP members and customers across the country and around the world, Scott said, powering their election night maps and filling the vote total graphics shown online and on air.

State-based analysts and editors in Washington at AP's Decision Desk also use that vote count to call races. Along with the vote count, Scott said, the decision team uses additional information provided by AP's election research team, such as demographic data about a state and statistics about advance voting, to make race calls.

“AP does not make projections or name apparent or likely winners,” Scott said. “If AP cannot definitively say a candidate has won, we don't speculate.”

NBC News and other TV networks

ABC, NBC, CBS and NBC are in Edison Research’s National Election Pool. The Associated Press used to be a part of this pool, but they now run their own projection models with the AP VoteCast.

Both the National Election Pool and AP VoteCast collect data that is used to project races, with exit polls being a key component of both. The AP explains VoteCast also reaches beyond exit polls – reaching voters by mail, phone, and online like a traditional poll – to account for early and mail-in voters. The National Election Pool expanded in-person early voting interviews this year to account for increases in such voting.

The different media outlets who call races separately follow similar methodology and decision-making to the AP, even if it’s not entirely the same. That means that they may call races soon after each other, but not call them at the exact same time.

This is true even of the networks that use the National Election Pool. For example, ABC News has opted to take longer to call races than other media outlets this Election Day and has generally waited until after precincts begin to report vote counts to call races.

NBC says they make most of their calls on election night races “based on analyses of precinct- and county-level vote returns.”

Fox News, on the other hand, call their races based on Fox News Voter Analysis. They work in partnership with the AP and their VoteCast, and thus use the same methods they do to take into account early votes.

The bottom line

Some media outlets call races as soon as polls close when exit polls match historical trends and expectations for a state. They may also call races for a candidate who is currently losing based on where votes have been counted at that point in the night.

Not all media outlets are opting to call races that early this election. Some are taking a more conservative approach.