U.S. Senate Republicans stood together Monday to successfully block lawmakers from moving ahead with sweeping legislation to overhaul U.S. financial markets, a temporary stumble for the Obama administration's top domestic policy priority. The Senate voted 57-41 on a procedural measure allowing lawmakers to move toward debate on financial regulatory overhaul legislation, falling short of the 60 votes needed. All GOP senators present voted against invoking cloture, joined by at least one Democrat, Sen. Ben Nelson (D., Neb.). The partisan vote underscores the high political stakes surrounding the legislation, which would subject the nation's financial institutions to new consumer and capital...