Primaries in four states could have big say in who will control Congress

Voters in Nevada, Maine, South Carolina and North Dakota to pick Republican and Democratic candidates in key races

Four states will hold congressional primaries on Tuesday, and the results could have sweeping implications for this year’s battle over control of Congress.

In Nevada, a dozen Republicans are vying for their party’s Senate nomination, but the primary appears to have become a two-person race between the retired army captain Sam Brown and former US ambassador to Iceland Jeff Gunter. Polling indicates Brown has a significant lead over Gunter, and Brown has received a last-minute boost from Donald Trump, who made a much-awaited endorsement in the race on Sunday.