WASHINGTON (AP) — Republicans in the Senate dealt President Barack Obama the third in a string of defeats on his stimulus-style jobs agenda Thursday, blocking a $60 billion measure for building and repairing infrastructure like roads and rail lines. Supporters of the failed measure said it would have created tens of thousands of construction jobs and lifted the still-struggling economy. But Republicans unanimously opposed it for its tax surcharge on the wealthy and spending totals they said were too high.