Pennsylvania wasn't the only state to hold midterm primary elections Tuesday. Three other states — Idaho, Nebraska and Oregon — also voted to determine party nominees ahead of November's midterm elections.

Here are key things to know about the national picture:

>> READ MORE: Pa. primary results will resonate in national fight for control of Congress

Here's a brief run-down of what happened in the most interesting primary races from elsewhere in the country Tuesday night.

Nebraska

In the Cornhusker State, at least two race are expected to be somewhat competitive this November in the normally safe Republican stronghold.

In the Second Congressional District, which Barack Obama narrowly won in 2008 and Donald Trump narrowly won in 2016, incumbent Republican Don Bacon will take on nonprofit president Kara Eastman, who edged out former U.S. Rep. Brad Ashford in the Democratic primary by running on a progressive platform pushing for a single payer "Medicare for all" approach to health care and a $15 federal minimum wage.

As far as the Senate is concerned, incumbent Deb Fischer easily defeated four challengers in the Republican primary. Her opponent in the general election will be Lincoln City Councilwoman Jane Raybould, who also easily won the Democratic primary. President Trump offered praise of Fischer on Twitter Wednesday morning.

Despite Fischer's overwhelming advantage in fundraising, the race could potentially be competitive, according to the Cook Political Report.

Idaho

In the country's fastest-growing state, with most candidates positioning themselves as pro-Trump, the most interesting race was a surprisingly combative contest for governor won by Lt. Gov. Brad Little, who will likely become the state's first new governor in more than a decade.

As for Congress, both of Idaho's congressional seats are expected to remain in Republican hands in November. In Idaho's First Congressional District, real estate broker Russ Fulcher won the crowded Republican primary to succeed Labrador.

In Idaho's Second Congressional District, things were less interesting. Incumbent Michael Simpson, who has served since 1999, is unopposed in Tuesday's primary and expected to easily defeat Aaron Swisher, the winner of the Democratic primary, in November.

Oregon

None of Oregon's five Congressional races are expected to be competitive come November. Democratic incumbents Suzanne Bonamici, Earl Blumenauer, Peter DeFazio and Kurt Schrader easily defeated their primary opponents Tuesday night, and are overwhelming favorites to defeat their Republican challengers in the general.

The only Republican incumbent, Rep. Greg Walden, is expected to easily defeat former Phoenix City Manager Jamie McLeod-Skinner, who was the winner in the Second Congressional District's crowded Democratic primary. Walden, the chair of the House Energy and Commerce Committee, faced criticism within his left-leaning state for overseeing and supporting Republicans' ultimately failed efforts to repeal the Affordable Care Act, commonly known as Obamacare.

Remaining 2018 primary elections

May 22: Arkansas, Georgia, Kentucky, Texas (runoff)

June 5: California, Mississippi, Alabama, Iowa, Montana, New Jersey, New Mexico, South Dakota

June 12: Nevada, Maine, North Dakota, South Carolina, Virigina

June 19: Arkansas (runoff)

June 26: New York, Maryland, Utah, Colorado, Oklahoma, Mississippi (runoff), South Carolina (runoff)

July 17: Alabama (runoff), North Carolina (runoff)

July 24: Georgia (runoff)

Aug. 2: Tennessee

Aug. 7: Michigan, Missouri, Kansas, Washington,

Aug. 11: Hawaii

Aug. 14: Minnesota, Wisconsin, Connecticut, Vermont, South Dakota (runoff)

Aug. 21: Alaska, Wyoming,

Aug. 28: Arizona, Florida, Oklahoma

Sept. 4: Massachusetts

Sept. 6: Delaware

Sept. 11: New Hampshire

Sept. 12: Rhode Island