ROLL CALL: Senate’s Democratic Class of ’08 Faces New Challenges: First-term Democratic senators from competitive states are key to party keeping majority. “Once the building blocks to a supermajority, the first-term class of 2008 Democratic senators now finds itself as the cornerstone of a five-seat majority in danger of crumbling. First elected on the same ticket as President Barack Obama, their next fight carries inherent risks and disadvantages. This cycle, there are more than enough seats in play for Senate Democrats to lose the majority. But party aides remain confident in their eight first-term Democrats up for re-election — all of whom won GOP seats six years ago.”