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WASHINGTON >> Triumphant Republicans retained control of the Senate on Tuesday with relatively little suspense, ousting Democratic incumbents in Indiana, North Dakota and Missouri and delivering a victory to President Donald Trump by preserving the chamber as a showplace for his conservative agenda for two more years.

Despite Trump’s deeply polarizing effect on voters, the GOP harnessed his rock-solid popularity with hard-right voters in rural, deep-red states. They held onto seats in the South, Midwest and West and ensured at least a 51-49 Senate, the same margin by which they currently run the chamber.

Republicans paved their path to victory by defeating Democrats Joe Donnelly of Indiana, Heidi Heitkamp of North Dakota and Claire McCaskill of Missouri. They also held onto competitive seats in Texas, where Sen. Ted Cruz fended off Rep. Beto O’Rourke, the well-financed liberal darling, and in Tennessee, where Rep. Marsha Blackburn prevailed.

“Donald Trump went out and worked his tail off,” Sen. Cory Gardner, R-Colo., who heads the Senate GOP’s campaign committee, said in an interview. Gardner cited rallies that drew thousands in crucial states during the campaign’s closing weeks and added, “The president was THE factor.”

The significance of the GOP victory in the Senate, which the party has controlled for the past four years, was magnified because Democrats stood a solid chance of wresting control of the House from the Republicans.

That would give the Senate the role of blocking House-passed Democratic initiatives on everything from health care to the potential repeal of tax cuts on the wealthy that the GOP enacted last year.

It would also leave the Senate as the one chamber where it could highlight the GOP’s goals of tax and spending cuts, trade, immigration restrictions, curbs on Obama’s health care law and judicial nominations.

Actually passing many bills, however, will be difficult because the GOP will fall well short of the 60 votes needed to break through Democratic filibusters, procedural delays that kill legislation.

Republicans entered the night commanding the Senate only narrowly, 51-49. But a crucial piece of math was in their favor: The Democrats and their two independent allies were defending 26 seats, Republicans just nine.

With a few races unresolved early Wednesday morning, Republicans stood a chance of building on their majority by adding seats in such states as Florida, Arizona and Nevada. While some expected that Senate control could be unclear until well into Wednesday or beyond, the GOP ensured their majority well before midnight Tuesday.

Blackburn, a conservative and ardent Trump backer, defeated former Tennessee Gov. Phil Bredesen, 74. Bredesen had promised a bipartisan approach if elected and had won the endorsement of music star Taylor Swift.

Heitkamp lost to GOP Rep. Kevin Cramer, whom Trump persuaded to seek the Senate seat. Heitkamp was hurt late in her campaign by an ad that mistakenly named some women as victims of sexual abuse.

McCaskill was denied a third term by Josh Hawley, 38, Missouri’s hard-right attorney general, who called McCaskill too liberal for a state that has trended increasingly Republican.

The night’s news wasn’t completely disastrous for Democrats.

Democratic Sen. Joe Manchin was re-elected in West Virginia, a state Trump captured by 42 percentage points in his 2016 election triumph. Democratic incumbents also prevailed in Ohio, Pennsylvania, Michigan and Wisconsin, Midwestern states that Trump carried narrowly two years ago.

Overall, Democrats were defending seats in 10 states that Trump took in 2016, including five he won by at least a huge 19 percentage points.

Tuesday’s midterm elections were among the most bitter in years.

Democrats’ longshot prospects for capturing a Senate majority were pinned on expectations that their supporters, roused by revulsion toward Trump, would surge to the polls. Fueling their intensity have been Trump’s anti-immigration rhetoric and policies, his efforts to dismantle health care protections enacted under President Barack Obama and the #MeToo movement’s fury over sexual harassment.

“Ever since President Trump has been in office, it has just been not the country that I am used to or that I thought I would be in,” said Sarah Roth, 22, a Democratic voter from Minnetonka, Minnesota. “And so this really was my opportunity to help this country in changing who is making the decisions.”

Democrats also had history on their side: 2002 was the only midterm election in the past three decades when the party holding the White House gained Senate seats.

Republicans banked on those dynamics being offset by a vibrant economy and by a president whose insult-laden approach to political discourse was as stirring for conservative voters as it was infuriating to liberals.

Trump’s racially tinged anti-immigrant rhetoric, while unpopular among college-educated urban and suburban voters, proved helpful in deeply conservative areas.

“I believe he values immigration, but he wants to make sure we’re safe,” said Tina Newby of Wetland, Michigan, a GOP voter. “I like the fact that he is not a politician, and I forgive some of the socially incorrect or politically incorrect things that he says.”

AP VoteCast, a national survey of the electorate conducted by The Associated Press, highlighted the effect Trump was having on voters. Nearly 4 in 10 said they were casting ballots to express opposition to him, while just 1 in 4 said their vote was an expression of support for the president.

In other results, Vermont independent Sen. Bernie Sanders and Democrats Elizabeth Warren of Massachusetts, Kirsten Gillibrand of New York and Minnesota’s Amy Klobuchar were easily re-elected. Along with Sherrod Brown, a pro-labor lawmaker re-elected in Ohio, the four are considered potential 2020 Democratic presidential hopefuls.

GOP hopes of gaining a seat from New Jersey were dashed when Democrat Sen. Bob Menendez won a third Senate term, despite a federal bribery indictment that prosecutors dropped this year after a mistrial.

Also victorious was Republican Mitt Romney, the vanquished 2012 GOP presidential candidate who grabbed the Utah seat being vacated by the retiring GOP Sen. Orrin Hatch. Virginia Democratic Sen. Tim Kaine, his party’s defeated 2016 vice presidential candidate, won re-election.

AP VoteCast is a nationwide survey of more than 120,000 voters and nonvoters conducted for the AP by NORC at the University of Chicago