Pennsylvania top in U.S. for political ad spending

Pennsylvania leads states in political ad spending this election year at more than $507 million as of Monday, per data collected by AdImpact .

Why it matters: Pennsylvania could be ground zero in the battle for the White House and the Senate.

The big picture: Political spending in Pennsylvania and across the U.S. is expected to accelerate as the Nov. 5 election draws closer and now that President Biden has dropped out of the race.

• The pro-Trump super PAC MAGA Inc. has already pledged to run new ads attacking Vice President Kamala Harris , whom Biden endorsed.

By the numbers: Democrats were outspending Republicans in the Keystone State by $43 million as of Friday, per AdImpact.

• MAGA Inc. is the top spender in Pennsylvania so far, at $62 million.
• That's followed by pro-Democrat super PAC WinSenate ($49 million).

Zoom in: The most expensive race in the state is between U.S. Sen. Bob Casey and Republican Dave McCormick at nearly $193 million.

• That's followed by the presidential race at nearly $189.5 million.

Zoom out: Trailing Pennsylvania in political spending is Ohio (nearly $440 million) and California (about $290 million), per AdImpact.