Task: Question Answering
Input (English): Passage: The Redskins played the winless St. Louis Rams in week 6. The Redskins obtained an early lead when RB Clinton Portis scored on a 3-yard TD run.  The Rams responded with a Josh Brown 51-yard field goal. St. Louis scored again later in the second quarter when free safety Oshiomogho Atogwe returned a fumble 75 yards for a touchdown. The Rams increased their lead as Brown kicked field goals of 25 and 44 yards early in the 2nd half.  In the fourth quarter, Washington regained the lead with a Shaun Suisham 38-yard field goal and a Clinton Portis 2-yard rushing TD. St. Louis would come back to win the game on a 49-yard Brown field goal. 
Question: How many yards was Portis' longest touchdown run? 
Answer type: Number 
Output (English): 3.