Democrat U.S. Congressman Ed Markey will serve a 19th term in Washington.

Markey led Republican challenger Tom Tierney 75 percent to 25 percent with 41 percent of precincts reporting, according to Boston.com, which had called the race by 9:45 p.m. Markey's seat has traditionally been for the 7th District of Massachusetts, but that changed with redistricting last year.

Markey's new district is the 5th, and it added a sliver of Cambridge, previously represented by Michael Capuano, as well as the western towns of Southborough, Ashland, Holliston, Sherborn, and a large portion of Sudbury. Markey also lost the city of Everett.

Despite the district changes, Markey faced little difficulty in this year's election. He received $457,200 in campaign donations over the last two years, according to Federal Election Commission filings. Tierney, meanwhile, received $85 in campaign contributions and used a $9,600 loan to run his campaign, according to filings.