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"Obviously no one knows what is going to happen in next year's midterm elections, but analysts who have watched congressional elections for a long time are seeing signs that 2018 could be a wave election that flips control of the House to Democrats."

Whoa.

Even with the caveat that the 2018 election is 545 days away and lots can and will change, that's a bold statement.

So, is it born out? Let's go through the indicators that have foretold past wave elections in the House.

"Since 1946, when presidents are above 50% approval, their party loses an average of 14 seats in the US House in the midterm elections, compared with an average loss of 36 seats when presidents are below that mark."

It's long been true that it's harder to beat an incumbent -- unless that incumbent is horribly damaged by self-inflicted scandal -- than it is to win a seat where no incumbent is running. The more retirements -- or members leaving their seats for other gigs -- the more volatility in the House playing field and the better chance a wave takes out a whole lot of seats.

Several of the pieces -- history, low presidential approval ratings, a generic ballot edge -- are in place for a Democratic wave election. What we don't know: What will the poll numbers for Trump and on the generic ballot look like in October 2018, and just how many Republican House members will head for the exits or run for higher office?

In short: The wave, if it's forming, is still way out in the ocean. But the conditions are right -- right now -- for it to get bigger and bigger.

More here:
Is there a Democratic wave building for 2018? - CNNPolitics.com - CNN