The war over a Labor Department proposal that would raise investment advice standards for retirement accounts is being waged from opposite sides of Pennsylvania Avenue.At the west end of the famous thoroughfare in Washington is the White House, where President Barack Obama has been at the forefront pushing for the rule since it was introduced last year. Over the last few weeks, the highest-profile opponent of the rule has emerged from the U.S. Capitol at the east end of the street, House Speaker Paul D. Ryan, R-Wisc. Since Feb. 22, Mr. Ryan's staff has blogged about or Mr. Ryan himself has
