Want to get the Daily Brief by email? Sign up here. Opponents of the proposed Central Maine Power corridor through western Maine won key votes in the House of Representatives on Thursday, setting up a likely lobbying race to flip legislators and a potential showdown with Gov. Janet Mills afterward. Those votes, which cut across party lines, underlined the complex politics of the unpopular transmission line and threaten to drag the Democratic governor further into a debate she entered in February when she declared support for the corridor after parties inked a $260 million benefits package. The House approved bills that would force local approval of the corridor and make it harder to take property by eminent domain for similar projects.