Key Senate races tighten with a flood of GOP ad spending

Celebrity TV doctor, Mehmet Oz, left, has benefited from millions of dollars spent on TV ads from outside groups to help him close the gap with Lt. Gov. John Fetterman in the Pennsylvania Senate race. (Nate Smallwood/Bloomberg via Getty Images)

With exactly four weeks left for ballots to be cast in the 2022 midterm elections, the landscape for control of the Senate is shifting again.

The field has moved slightly back in Republicans' direction, in part, because of a natural tightening closer to November as the races come into focus for more people, but also because of a deluge of television advertising in key races supporting GOP candidates.