After months of "Democrats are doomed" chatter, there's been a definite shift in mood and momentum toward the party in power. Republicans are openly fretting about their flawed and under-funded Senate candidates, while Democrats, who not long ago were bemoaning fumbles by the White House and Democratic leadership in Congress, are now sharing "Dark Brandon" memes and polling data showing Democrats ahead in key Senate contests. But is all of this just a vibe shift? Or has there been real movement toward Democrats?