Democrats start out ahead in Pennsylvania, Wisconsin 2024 Senate races CBS News Battleground Tracker poll [Video]

As Democrats play defense in U.S. Senate races this year, two battleground-state incumbents start out ahead in their reelection campaigns. Bob Casey in Pennsylvania and Tammy Baldwin in Wisconsin are currently leading their lesser-known Republican challengers by seven points.

Both Casey and Baldwin enjoyed large margins of victory in 2018, but their reelection bids look more competitive at the moment in what is a more challenging environment. We find plenty of undecided voters and good reasons for the races to tighten as the campaigns heat up this fall.

Why things might change

These estimates are snapshots of the race early in the election cycle. With several months to go before voting starts, there is plenty of time for movement. 

So here’s why things could change: For one, the Republicans in the race are not well-known to voters. It was under …