In a pointed letter critical of Gov. Jerry Brown's tax rival, California's two U.S. senators along with state legislative leaders called Thursday for a cease-fire from campaigns backing the two multibillion-dollar tax hikes on the November ballot. U.S. Senators Dianne Feinstein and Barbara Boxer, as well as Senate President Pro Tem Darrell Steinberg and Assembly Speaker John A. Pérez, said in a letter to the California State PTA that the Proposition 38 campaign has "become increasingly negative" and "engaged in personal attacks against Governor Jerry Brown and Prop. 30." The PTA has joined wealthy attorney Molly Munger in backing Proposition...