The Sierra Club on Wednesday launched a multistate digital ad campaign aimed at persuading seven U.S. senators—six of them Democrats—to back the Biden administration’s already weakened tailpipe pollution standards for passenger cars and light-duty trucks. The new campaign targets Sens. Bob Casey (D-Pa.), John Fetterman (D-Pa.), Tim Kaine (D-Va.), Mark Kelly (D-Ariz.), Kyrsten Sinema (I-Az.),…
