LONDON — If you thought Keir Starmer was in trouble now, just wait for Thursday’s elections. The opinion polls would have to be “dramatically out” for the British PM — already hit by dire favorability ratings, a scandal over his pick for U.S. ambassador, and deep disenchantment among his own MPs — to avoid a terrible set of results in nationwide votes held May 7, top psephologist John Curtice, a professor at the University of Strathclyde, says. With local votes taking place across swathes of