Democratic strategist James Carville has some industrial-strength partisan blinders (he wrote a book in 2009 about how the Democrats were going to rule America for the next 40 years; they lost the House one year later), but even he can’t polish up the donkey droppings facing the party in 2018. Carville is warning Democrats not to get their hopes up about taking back the Senate because it’s not very likely to happen, although he does say there’s a chance they could win the House back.
As long as we’re reviving the Ice Bucket Challenge to dump cold reality on delusional Democrats, I should also point out the fallacy in their theory about taking back the House. Hillary Clinton wants to hit the campaign trail again because, as she points out, there are over 20 districts up in 2018 that have Republican incumbents but where she beat Trump. She seems to think that means the voters there are turning leftward. No, that’s not what it means at all. It just means that a fair number of Republicans were so turned off by Trump or worried by the overwhelmingly negative ads and media coverage of him (he was an unknown quantity at the time, which scares some people) that they either didn’t vote or held their noses and voted for Hillary.
That doesn’t mean that in 2018, they’ll eagerly rush to the polls to vote against Republican incumbents they know well and have already elected and, in some cases, reelected repeatedly. Also, I think you’re suffering from some pretty severe delusions if you think that having Hillary Clinton back on the campaign trail will inspire Republicans to turn out and vote any way other than straight Republican. No, I think the only way the Republicans will lose control in 2018 is if they keep failing to take the actions they promised the voters. In that case, Republicans won’t vote for Democrats, but they might decide there’s no point in voting at all and just stay home.