WASHINGTON — Delivering at last, triumphant House Republicans voted Thursday to repeal and replace the "Obamacare" health plan they have reviled for so long, overcoming united Democratic opposition and their own deep divisions to hand a major win to President Donald Trump. The 217-213 vote was a narrow victory, and ultimate success is far from assured since the measure must still make its way through a highly skeptical Senate. But after seven years of campaign promises and dozens of show votes, Republicans finally succeeded in passing a health care bill that has a chance of becoming law.