President Joe Biden’s seemingly unassailable “blue wall” appears to be crumbling in the wake of former President Donald Trump’s greatest political comeback in history.

The “blue wall” represents three battleground states: Michigan, Pennsylvania, and Wisconsin. Biden must win these states to prevent Trump from winning reelection.

For the first time in 2024, Trump held a narrow lead in Wisconsin, Pennsylvania, and Michigan, Tuesday’s Emerson poll showed. Previous swing state polling showed Trump leading in Wisconsin and Pennsylvania, with only Michigan leaning toward Biden.

Seven states — Michigan, Pennsylvania, Wisconsin, Arizona, Georgia, Nevada, and North Carolina — will decide the president, longtime Democrat adviser Doug Sosnik wrote in the New York Times. If Trump wins one or more of Pennsylvania, Michigan, and Wisconsin, Biden’s chances of obtaining 270 electoral votes become slim.