WASHINGTON (AP) — The Senate approved President Barack Obama’s economic stimulus measure Tuesday, part of a series of government steps that could marshal close to $3 trillion to revive the collapsing national economy. The 61-37 vote by the Senate was a key victory for the president but sets up difficult negotiations with the House, which passed a slightly different version from the $838 billion bill approved Tuesday. Majority Leader Harry Reid, D-Nev., vowed to send a finished bill to Obama’s desk “as soon as possible.”–Contact The Daily Reveille’s news staff at [email protected]