Baltimore County State Sens. Jim Brochin and Delores Kelley and two other lawsuits challenged that the maps were not legally drawn.
Two groups funded by developers, including David S. Brown Enterprises and David Cordish, seek to overturn zoning for the Solo Cup and Middle River Depot properties.
President Obama defeated Republican Mitt Romney in the 2012 presidential election.
The Baltimore County Democrat first claimed the seat in 2003.
Associated Press called for incumbent Ben Cardin to win re-election minutes after the polls closed in Maryland.
"We all sense that America is on the brink of declining," Harris told Maryland Republicans Tuesday night.
DREAM Act, expanded gambling and congressional redistricting also survive referendum challenges.
Voters in Maryland on Tuesday gave the state's 10 electoral votes to Barack Obama.
Patch hits the streets on election day 2012. Post your own photos, videos and opinions here.
Images from across the country on Election Day 2012 as Barack Obama and Mitt Romney square off in the race for the White House.
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