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Democratic presidential candidates from left, Sen. Elizabeth Warren, D-Mass., former Vice President Joe Biden, Sen. Bernie Sanders, I-Vt., Sen. Amy Klobuchar, D-Minn., and businessman Tom Steyer participate in a December debate in Los Angeles.The Associated Press

A U.S. stock market that has weathered trade wars, weak corporate earnings and a U.S.-Iran conflict to continually hit record highs faces a new obstacle: the 2020 election season.

Investors are bracing for more volatility as soon as early February, when Democratic voters in Iowa and New Hampshire kick off the primary season. Clues about which candidates will have momentum heading into next month will emerge on Tuesday, when the Democratic Party holds its next presidential debate.

Stocks could retreat if a progressive candidate scores a few early victories or if seemingly more market-friendly moderates, such as former vice president Joe Biden, fail to register much support.

The market may face political uncertainty for months if it takes a long time to select the Democratic candidate, who would then face a hard-fought race against President Donald Trump before the November election.

“Investors could potentially sit on the sidelines waiting for more clarity around the election,” said Michael Arone, chief investment strategist at State Street Global Advisors in Boston.

“It wouldn’t surprise me, especially coming off what has been a very solid year in markets, for investors to kind of take a wait-and-see approach,” Mr. Arone said.

After gaining about 29 per cent in 2019, the benchmark S&P 500 has kept pushing higher, minting fresh record highs on Thursday as U.S.-Iran tensions appeared to ease.

Some investors still believe Wall Street is ripe for a pullback.

“The domestic calendar for the primary season is going to be a source of volatility,” said Alicia Levine, chief strategist at BNY Mellon Investment Management. “I think the market will use it as an excuse to come in a little bit, and take some heat out of the market and take some of the froth out of the market, depending on some of these outcomes.”

Ms. Levine called the elections a “sleeper issue” because stocks are pricing in a market-friendly outcome.

Investors said they are weighing scenarios that would be relatively favourable for stocks over all. These include Mr. Trump’s re-election and a victory by a seemingly moderate Democratic candidate, such as Mr. Biden or former New York mayor Michael Bloomberg.

But stocks could fall if U.S. senators Bernie Sanders or Elizabeth Warren, who are seen as more likely to push for increased regulations in areas such as health care and technology, and for wealth taxes, outperform in the primaries.

“The more Joe Biden and other moderates are overtaken by the progressives, I think the market will very gradually begin to price in more headwinds,” said Dave Lafferty, chief market strategist at Natixis Investment Managers in Boston.

Shares of health-care companies faced pressure last year over worries that Ms. Warren and Mr. Sanders would push through a government-run Medicare for All. Those fears have eased, but health care is one sector likely to face the election spotlight this year, along with technology, financials and energy.

With no strong favourite currently, Mr. Trump’s Democratic opponent may not be clear by March 3, when more than a dozen states vote on Super Tuesday.

“Uncertainty is never good for the stock market,” said Matt Maley, chief market strategist at Miller Tabak, who added that following Super Tuesday, “you usually know who the candidates are going to be, and this time around there’s a good chance that you won’t.”

Another factor is control of Congress. Mr. Trump’s Republican party holds the Senate, while Democrats have a grip on the House of Representatives - split control that investors say is relatively market friendly.

But if there is a Democratic wave in November that also flips the Senate, stocks could be hit, investors said, as presidential and congressional control by one party could pave the way for major policy overhauls.

“The most violent reaction would be to a progressive Democrat with the potential for control of Congress,” Mr. Arone said. “I give that a low probability, but that’s what investors are most concerned about.”

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