(CNN) -- Democrats are projected to pick up three GOP-held Senate seats and are holding a narrow lead in a fourth in their bid to regain control of the Senate.
Three other states -- Missouri, Montana and Tennessee-- will complete the equation. Democrats need to win six GOP-held Senate seats to regain control.
CNN projects Democratic wins in Rhode Island, Pennsylvania and Ohio.
In Virginia, Democratic challenger Jim Webb holds a narrow lead over incumbent Sen. George Allen in early returns in the Senate race. Webb holds a 1-point lead with 81 percent of the precincts reporting.
State treasurer Robert Casey Jr. is projected to defeat Pennsylvania Sen. Rick Santorum, the third-ranking Senate Republican, and Democratic Rep. Sherrod Brown is projected to unseat incumbent Republican Sen. Mike DeWine in Ohio.
Rhode Island's Republican Sen. Lincoln Chafee, one of the few moderates in the Senate, is projected to lose to Democrat Sheldon Whitehouse, the former state attorney general.