John McCain and Barack Obama both know that when it comes to the economy, the next president will have to hit the ground running. But the ground keeps shifting and the crisis has produced demands for detailed proposals from both candidates. On Monday, Obama outlined a rescue plan worth about $110 billion. Yesterday, McCain countered with about $52 billion. After a day when stocks have been falling again, voters will see the candidates under pressure tonight in unpredictable circumstances. We compare what they've come up with so far on foreclosures, investments, home mortgages and all kinds of taxes. With three weeks until election day, which constituencies are they aiming at? In the debate, will McCain attack as promised? Will Obama dare to be dull?