Democrats' chances of keeping their Senate Seats in critical battleground states

With the Senate control up for grabs, Republicans and Democrats seek to maintain their seats. Here's how some Democrat incumbents are polling. (Credit: AFP)

Control of the Senate is likely to be up for grabs in November, as Democrats currently hold a slim 51-49 majority. But with both parties vying for power, certain Democratic incumbents in different parts of the country seem to be comfortable within their own races.

That is the case in Pennsylvania, for instance, where Sen. Bob Casey will seek to keep his Senate seat against Republican David McCormick.