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... In the midst of such confidence, however, Democrats are ignoring glaring vulnerabilities that threaten to undermine the unstoppable blue wave they say is coming.

Look no further than swing-state New Hampshire, where Democratic leaders are sounding the alarm about political challenges that could jeopardize Rep. Chris Pappas' campaign for an open Senate seat and undermine the party's ability to win races around the country.

Democrats point to Republicans' overwhelming financial advantage that is allowing them to dominate the airwaves in the closing days of the campaign. At the same time, the Democrats' brand remains deeply unpopular, and they have virtually no margin for error in midterm races that are playing out largely in Republican-leaning states.

New Hampshire Democratic Chairman Ray Buckley says that national Democratic leaders "have consistently been overly optimistic" as they look to expand the midterm map. He's particularly worried about his state's Senate contest, where Republicans are investing far more resources than Democrats. ...