Joe Biden with his wife and sister at a Super Tuesday rally. Photo: David McNew/Getty Images

Joe Biden has won the Maine Democratic primary, according to AP.

Why it matters: It's the last Super Tuesday primary to be called and further adds to Biden's delegate lead.

The big picture: Aggregated polling averages leading up to Super Tuesday showed Bernie Sanders with a strong lead in Maine, where 24 delegates are up for grabs. But Biden saw a huge day-of voting surge after Pete Buttigieg and Amy Klobuchar suspended their campaigns and endorsed the former vice president hours before polls opened.

Go deeper: Follow the Super Tuesday results

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Trump demands apology over CNN poll showing Biden with 14-point lead

President Trump. Photo: Doug Mills-Pool/Getty Images

President Trump's reelection campaign in a cease-and-desist letter to CNN's CEO Jeff Zucker on Wednesday requested the network publicly apologize for a poll that showed former Vice President Joe Biden with 14-point lead.

Why it matters: CNN's poll came as part of a recent wave of bad news for the president. Fallout over Trump's response to the COVID-19 pandemic and nationwide Black Lives Matter protests have resulted in a spike for Biden in the latest polls, including in swing states such as Michigan and Texas.

Updated Jun 14, 2020 - Politics & Policy

Black Lives Matter protests: What you need to know

Protesters outside the Minneapolis 1st Police precinct during a demonstration against police brutality and racism in Minneapolis, Minnesota, on Saturday. Photo: Kerem Yucel/AFP via Getty Images

The death of Rayshard Brooks, another black man fatally shot by police, outside an Atlanta restaurant became a focal point of anti-racism protests across the U.S. on Saturday.

The big picture: Protesters are highlighting systemic racism issues across the U.S. and pressing states to make changes on what kind of force law enforcement can use on civilians. It has prompted officials to review police conduct.

Gallup: Trump’s net approval rating drops 19 points in a month

Photo: Chip Somodevilla/Getty Images

President Trump's approval rating has dropped from 49% to 39%, while his disapproval rating has shot up from 48% to 57%, according to the latest Gallup tracking poll out Wednesday.

Why it matters: It's the lowest net approval rating the president has recorded since October. The poll is Gallup's first since nationwide protests erupted in the wake of the killing of George Floyd.