The big banks and their lobbyists are vigorously resisting a rewrite of their operating rules and working hard to insert loopholes and exclusions that would gut the legislation. Obama can prevent that from happening by spelling out the benchmarks the legislators must meet to avoid his veto pen. The details of financial reform can be complicated. But it's not hard to come up with the must-have provisions. Here are five that the White House should insist upon to make sure we get financial reform that works, not just window dressing.