Just like when a running back sees an opening, he takes it. And if he's powerful enough -- think Earl Campbell back in his glory days or Chris Berman favorite Mike Alstott or a healthy Ladainian Tomlinson -- he can take that small opening, throw off defenders and cause some damage.
Try as they may, Team McCain doesn't have Earl Campbell's 1978 legs right now. And McCain's offensive line? They're not the Hogs. They best they can do is to look for some mistake, some gaffe, some blunder.
Joe the Senator
Enter Joe Biden.
Yesterday, the Republican camp was trying to score some points from speeches the Delaware Senator gave on Sunday where he guaranteed an international crisis if the Obama-Biden ticket is elected.
"Mark my words: It will not be six months before the world tests Barack Obama like they did John Kennedy," Biden told the crowd. "The world is looking. We're about to elect a brilliant 47-year-old senator president of the United States of America. Watch, we're going to have an international crisis, a generated crisis, to test the mettle of this guy."
“He’s going to have to make some really tough - I don’t know what the decision’s going to be, but I promise you it will occur. As a student of history and having served with seven presidents, I guarantee you it’s going to happen," he said.
The McCain communications team jumped - emailing Biden's remarks around, along with McCain's prepared response and an announcement of a conference call led by Rudy Giuiliani to help frame the issue.