This week will be one of Washington's busiest of the year. Congressional members are facing a Saturday, 30 June deadline on the highway bill. Potentially making that debate thornier is the move among some House Republicans to attach the Keystone XL pipeline authorization to that piece of legislation. Additionally, interest rates on student loans are set to double to 6.8 percent if there is no congressional action before 1 July. After that, the House will vote on a resolution to hold Attorney General Eric Holder in contempt of Congress over documents related to the "Fast and Furious" gun running operation. Also scheduled for Tuesday night is the transportation appropriations bill, the first of two appropriations bills scheduled for this we...