The Vancouver Whitecaps gave it their best shot to maintain their perfect season here yesterday against the Philadelphia Union and their boisterous Sons of Ben fan club —which cheers its heroes and jeers the opposition nonstop the entire game. They really did. But in the end the Caps simply couldn’t overcome a red card to striker Eric Hassli — his second yellow-card infraction of the day — forcing them to play a man down the final 35 minutes. The Union applied consistent pressure from there, finally converting an opportunity goal from Carlos Ruiz in the 79th minute to squeeze out a 1-0 win that might’ve been a different story otherwise.