Sen. Mitch McConnell (R-Ky.) late Thursday left Democrats angry and sputtering on the Senate floor, as he used his new power as majority leader to brush off several Democratic amendments in an effort to speed up work on a bill to approve the Keystone pipeline. McConnell has so far made a point of allowing amendment votes, something Democrats barely allowed for the last few years. Earlier Thursday, McConnell boasted that the Senate had already held more amendment votes on the Keystone bill than Democrats allowed during all of 2014. “We’ve actually reached a milestone here that I think’s noteworthy for...