Platts.  Natural gas pipeline companies have spent $2.3 million on US political campaigns ahead of Tuesday's federal elections, a modest $100,000 increase from the 2006 mid-terms, even as Congress considers tightening pipeline safety oversight and curbing carbon emissions. The industry gave $1.3 million, or about 57% of the total, to Republican candidates and $934,000, or 41% of the total, to Democrats, according to the latest filings tracked by the Center for Responsive Politics. The sector has favored Republicans in every election cycle since 1994.  (Comment.  The entire energy sector should [...]