Michael R. Bloomberg, the billionaire former mayor of New York City, has decided to throw his political clout and personal fortune behind the Democratic campaign to take control of the House of Representatives this year, directing aides to spend tens of millions of dollars in an effort to expel Republicans from power.
Mr. Bloomberg a political independent who has championed left-of-center policies on gun control, immigration and the environment has approved a plan to pour at least $80 million into the 2018 election, with the bulk of that money going to support Democratic congressional candidates, advisers to Mr. Bloomberg said.
By siding so emphatically with one party, Mr. Bloomberg has the potential to upend the financial dynamics of the midterm campaign, which have appeared to favor Republicans up to this point. Facing intense opposition to President Trump and conservative policies, Republicans have been counting on a strong economy and heavily funded outside groups to give them a political advantage in key races, especially in affluent suburbs where it is expensive to run television ads.
Mr. Bloombergs intervention is likely to undermine that financial advantage by bankrolling advertising on television, online and in the mail for Democratic candidates in a dozen or more congressional districts, chiefly in moderate suburban areas where Mr. Trump is unpopular. Democrats need to gain 23 congressional seats to win a majority.
While Mr. Bloomberg has not chosen his list of targeted races yet, he is unlikely to get involved in rural, conservative-leaning districts where his views on guns and other issues could stir an uproar, according to people briefed on his plans, some of whom spoke on condition of anonymity to discuss private deliberations.
The new alliance between Mr. Bloomberg, 76, and congressional Democrats marks a fresh stage in the former mayors political evolution. And it promises to put New York and its political leaders even more squarely at the center of a midterm campaign already stocked with prominent characters from the city, including a president who made his fortune in Manhattan real estate; the top Democrat in the Senate, Chuck Schumer; and Mr. Bloombergs predecessor in Gracie Mansion, Rudolph W. Giuliani, who serves as a lawyer for Mr. Trump.
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