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WASHINGTON — As Democrats brace for a November wave that threatens their control of the House, party leaders are preparing a brutal triage of their own members in hopes of saving enough seats to keep a slim grip on the majority.

In the next two weeks, Democratic leaders will review new polls and other data that show whether vulnerable incumbents have a path to victory. If not, the party is poised to redirect money to concentrate on trying to protect up to two dozen lawmakers who appear to be in the strongest position to fend off their challengers.