Washington Post: Congress will return this week from the July 4th recess to a pile of unfinished business. Yes, the same might be said of every Congress returning from every recess since lawmakers wore wigs and tights. But this time it could be a big problem, especially for the party in power. When Barack Obama took office and the Democrats took control of Washington, they made ambitious promises about how much they’d get done, with or without Republican help. Now, with relatively few working …