Seems a bit early to be directing attention to Congress. Undecideds could still break for Trump resulting in an even race for the EV.
At this point, there probably aren't many people who are truly undecided and will actually vote; if they haven't settled on a candidate by now, they may just skip it. But of those that do vote, one metric that may be useful is their relative favorability. Clinton is unpopular, but Trump is much more so. The last Gallup survey I can find (Oct. 14-20) has Clinton at 42/54 (-12), but Trump is at 31/66 (-35). Assuming that undecideds match this sample (which I know is a totally unjustified assumption, but what else can you do?), an undecided voter is more likely to think worse of Trump than of Clinton.
