A dispute between Republicans and Democrats over several controversial amendments last week bogged down Senate action on a package of bills to fund, among other things, the federal transportation programs in FY 2015.  The measure would preserve current levels of highway investment, boost transit spending by $200 million and provide a $100 million increase for airport capital projects.  While the Senate had been working to complete action on the legislation by the end of the next week, Republican efforts to offer amendments to stop Obama Administration regulations on climate change and wetlands led Democrats to suspend further action on the measure.  It is unclear if, or when, the two sides will be able to resolve their difference and allow the measure to move forward.  The House passed its version of the FY 2015 transportation funding bill June 12.