THE POST’S endorsements in Northern Virginia’s contested races for the House of Delegates continue, with our choices appearing in bold type. Previous endorsements are online at www.wapo.st/VAendorsements2013/.

To determine your legislative district and candidates on your ballot, go to http://1.usa.gov/­1hIuAb.

District 53: In this open-seat race in one of the state’s most heavily Democratic districts, Marcus B. Simon is the obvious choice to replace Del. James M. Scott, who is retiring. Mr. Simon, a Democrat and a lawyer, was once an aide to Mr. Scott; he is also deeply knowledgeable about local affairs in Fairfax County, having served as chief of staff to Katherine K. Hanley, former chairman of Fairfax County’s Board of Supervisors. The Republican candidate, W. Brad Tidwell, offers no serious competition.

District 67: James M. LeMunyon is one of the more respected Republican lawmakers from Northern Virginia. He was among the House conservatives who bucked right-wing orthodoxy and voted for the first major transportation-financing legislation to clear the state legislature in more than 25 years. He has also advocated for bills to promote transparency and good government, so voters can forgive him for gimmicks such as a measure that would permit the repeal of federal legislation if it is rejected by two-thirds of the states. His Democratic challenger, Hung Q. Nguyen, is a community activist and technology consultant with extensive experience working with the vibrant Asian community in western Fairfax and eastern Loudoun counties. But Mr. Nguyen, a political novice, is unlikely to be as effective in Richmond as Mr. LeMunyon.

District 86: Few members of the House of Delegates were more persistent, instrumental and influential in pushing for and enacting the transportation-financing legislation than Republican Thomas Davis Rust. As desperately needed revenue starts flowing and putting a dent in Northern Virginia’s traffic over the coming years, Mr. Rust will deserve enormous credit for devoting years to leading on an issue that many in the GOP preferred to ignore. On other issues as well, Mr. Rust, the former mayor of Herndon, has been one of the rare advocates in his caucus for sensible bipartisan cooperation. He deserves reelection over Democratic Party activist Jennifer B. Boysko.

District 87: Republican David I. Ramadan is a tea party disciple who favors right-wing doctrine over workable solutions to the state’s most persistent problems. Having signed a pledge never to raise taxes, even to fix the state’s badly congested transportation network, he opposed the transportation-financing bill. That vote directly contravened the interests of his constituents in Loudoun County, who struggle with traffic and long commutes every day. Fortunately, Mr. Ramadan is opposed by an excellent Democratic challenger, John J. Bell, a retired Air Force officer with expertise in finance, budgeting and program efficiency who would bring a badly needed analytical approach. Mr. Bell, who is thoughtful, practical and smart, would represent a major improvement.