Besides the high-profile presidential primaries tonight, Maryland was also home to two highly-contested Congressional primaries, pitting moderate incumbents against intra-party challengers.

On the Democratic side, Rep. Al Wynn was facing a rematch against attorney and social activist Donna Edwards, who only lost to Wynn by three points in an anti-war challenge in 2006. With 39% reporting, Edwards is way ahead of Wynn at 59%-36%.

On the Republican side, Rep. Wayne Gilchrest, who has turned against the Iraq War and now votes with the Democrats, was up against two opponents: State Sen. Andy Harris, who has the backing of former Gov. Bob Ehrlich, and state Sen. E.J. Pipkin, the 2004 nominee for U.S. Senate. With 38% reporting, Gilchrest is also in trouble — Harris has 42%, Gilchrest 33%, and Pipkin 22%.

We'll keep you posted on these races as more results come in.

Late Update: With 51% reporting, the Associated Press has projected Donna Edwards the winner over Al Wynn — and apparently by a landslide. In Gilchrest's district, Harris leads 41%-35% with 74% of precincts in. No projection has yet been made, but it's not looking good for the incumbent here.

Late Late Update: Harris has been projected the winner over Gilchrest.