Anthony Brown lost the 2014 governor's race to a Republican.
Shuster's relationship with an airline lobbyist raised ethical questions.
State Sen. Jamie Raskin beat out David Trone, who set records for self-funding.
Fattah faced a multicount federal indictment.
Art Halvorson will face Rep. Shuster in Tuesday's primary.
Tuesday's races test if incumbents can win under ethical clouds and the power of self-funding.
Cristina Marcos 04/21/16 05:01 PM EDT
Rep. David Young wants his pay to be withheld until the chamber passes a budget.
Graham was considered one of the most vulnerable Democrats this cycle.
Maryland's David Trone is now the highest spending House candidate in history.
Democrat David Trone is pouring millions of his own money into a House race.