4 states decide primaries; Trump's Senate pick wins in Pa.

Tuesday's primary elections will begin to settle swing state Pennsylvania's chaotic congressional landscape after a court fight ended with redrawn districts just three months ago.

Pennsylvania primary voters selected President Donald Trump's pick to be the Republican nominee for U.S. Senate. Idaho voters are set to pick their Republican gubernatorial nominee, while heavily Republican Nebraska and Democratic-leaning Oregon are also holding primaries Tuesday.

A look at one of the key races:

PENNSYLVANIA SCRAMBLE

Republicans outnumber Democrats in Pennsylvania's House delegation, though a new congressional map is making the state a focal point of Democrats' effort to reclaim House control in November.

Eighty-four candidates are running in 18 House districts in light of new courtordered redrawn congressional district maps in February. That's more than any time since 1984, when Pennsylvania had 23 seats in the House.

Five of Pennsylvania's 13 GOP House members have quit or are not running again, helping create seven House vacancies, the most in Pennsylvania since 1976.

Moderate Charlie Dent is abandoning Pennsylvania's new 7th District, where Hillary Clinton received more votes than Trump, who carried Pennsylvania. Six Democrats are running in this district, which reunified Democratic-leaning cities in the east and cut out some of Republican-leaning central Pennsylvania.

Ten Democrats are running in suburban Philadelphia's 5th District, where Rep. Patrick Meehan resigned last month amid allegations he sexually harassed a former employee and where Clinton also beat Trump.