By Patricia ZengerleWASHINGTON, March 4 (Reuters) - Lawmakers in the U.S. Senate were set to begin voting on Wednesday on a bipartisan war powers resolution aiming to stop the military campaign against Iran and require that any hostilities against it be authorized by Congress.The latest effort by Democrats and a few Republicans to rein in President Donald Trump's repeated troop deployments, sponsors describe it as a bid to take back Congress' responsibility to declare war, as spelled out in the...