WASHINGTON - A Senate panel voted Tuesday to provide weapons to rebels battling the forces of Syrian President Bashar al-Assad, the first time lawmakers have endorsed the aggressive U.S. military step of arming the opposition. ... "The greatest humanitarian crisis in the world is unfolding in and around Syria," said Sen. Robert Menendez (D., N.J.), the committee chief. ". . . The United States must play a role in tipping the scales toward opposition groups and working to build a free and democratic Syria." Sen. Bob Corker of Tennessee, the panel's top Republican, implicitly criticized the Obama administration as he...