FREEPORT — U.S. Sen.-elect Angus King said Wednesday a decision is coming soon on which party he’ll caucus with when he arrives in the U.S. Senate in January.

But the independent former governor warned that his membership in a party caucus isn’t an automatic vote for that party and against the other.

“Some kind of caucus decision will be necessary,” he said at a news conference. “Once that decision is made, it doesn’t mean I’ll be locked into one side and the opponent of the other side. I want to continue to build bridges.”

King spoke in Freeport the morning after winning the race for Maine’s open U.S. Senate seat with a majority of the vote, besting his Republican and Democratic rivals, Secretary of State Charlie Summers and state Sen. Cynthia Dill. With 95 percent of precincts reporting, King had won 53 percent of the vote, compared to 31 percent for Summers and 13 percent for Dill.

Independents Andrew Ian Dodge and Danny Dalton each attracted 1 percent while a fourth independent, Steve Woods, garnered 1.5 percent, despite dropping out of the race the weekend before Election Day.

King said he received congratulatory calls from and intends to meet this week with retiring U.S. Sen. Olympia Snowe and Sen. Susan Collins, who will be Maine’s senior senator.

He said he also received a congratulatory call from Nevada Sen. Harry Reid, the Democratic majority leader. King said he hasn’t yet heard from national Republican leaders or Maine Gov. Paul LePage.

King will travel to Washington, D.C., this weekend for an orientation as a new member of Congress. One of his first steps, he said, will be to reach out to fellow former governors in the Senate, including Jeanne Shaheen of New Hampshire, Mark Warner and Tim Kaine of Virginia, Tom Carper of Delaware and Lamar Alexander of Tennessee.

“Former governors tend to be more bipartisan,” he said. “They also tend to be action-oriented.”

And King said he’s holding out hope that senators can start to overcome the gridlock that’s characterized the chamber in recent years.

“There’s a general realization that if we’re going to solve the public’s problems, we’ve got to get over this idea of party,” he said.

King’s remarks followed a hard-fought race punctuated by an influx of nearly $7.4 million that poured into Maine’s Senate race from outside groups hoping to sway the election.

King and his challengers Tuesday night all discussed the influence of outside spending. Republican-leaning groups poured in a majority of the funds, $4.24 million, in an effort to peel away support from King and create an opening for Summers.

But an influx of spending on King’s behalf followed. That barrage of spending from the Democratic Senatorial Campaign Committee and the non-profit group Americans Elect kept the race from getting closer, Summers said Tuesday night in Portland after conceding victory.

The Republican’s campaign “didn’t have the resources to counteract” that advertising, Summers said.

Despite the outside advertising, Summers said his campaign stuck to its original game plan.

“I’m very proud of the campaign,” he said. “I wouldn’t change a thing. I think we worked incredibly hard and really were able to take a campaign that nobody paid any attention to, to something that really became a hotly contested race.”

The Democratic Senatorial Campaign Committee, which didn’t endorse Democratic nominee Dill, became the biggest outside spender in Maine’s Senate race. The group poured $1.49 million into ads attacking Summers.

“When I look at the polls, they’re the same from beginning to end,” Dill said Tuesday night before voting at Cape Elizabeth High School. “At the end of the day, I don’t think it’s money that makes or breaks a campaign.”

As for his future, Summers said Tuesday night he would consider another term as secretary of state – a position elected by the Legislature – but said that before it was clear that Democrats had recaptured control of both legislative chambers.

“It’s just what it is,” he said of his loss. “You dust yourself off and you move on.”

Summers lost three previous bids to represent Maine’s 1st District in the U.S. House.

In the immediate aftermath of the race, Dill said she needed to tend to family business, but wouldn’t rule out another run for office.

“I don’t know exactly what’s next,” she said. “I really feel passionate about service. It’s the journey that counts. It’s not the final destination.”

While Maine’s 2012 Senate race was expensive and hotly contested, spending by the candidates for Maine’s open U.S. Senate seat fell well short of candidate spending in Maine’s last Senate race, in 2008.

That year, when U.S. Sen. Susan Collins was facing a challenge from former Democratic U.S. Rep. Tom Allen, candidate spending totaled $14.3 million.

Four years later, the candidates to replace Olympia Snowe had spent $5.3 million through mid-October.

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Independent former Gov. Angus King speaks to supporters Tuesday, Nov. 6, in Freeport after his election to the U.S. Senate seat being vacated by Sen. Olympia Snowe, R-Maine.