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

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.