
In 2018, what’s a swing state? In many cases, it’s not the swing states that everyone focused on in 2016. How should you optimize your activism and donations? tl;dr: You can donate via the PEC ActBlue page (if you like Democrats) or the NRSC (if you like Republicans).
The reason for the difference from 2016 is obvious: this year’s big questions are not the Presidency, but who will control the House, the Senate, and governor’s mansions and legislatures. In some cases, the hot races are still in purple states (Nevada, Florida), where the statewide vote is closely divided. But just as often, maybe more so, regional factors matter.
For example, Indiana is strongly Republican in its Presidential voting, yet Senator Joe Donnelly (D) beat the eccentric Richard Mourdock (R) for a Senate seat six years ago in 2012, a somewhat-good year for Democrats. This year, Donnelly has a fighting chance to retain his seat. More broadly, current polls indicate six knife-edge Senate races: Nevada (D-Rosen v. R-Heller), North Dakota (D-Heitkamp v. R-Cramer), Missouri (D-McCaskill v. R-Hawley), Florida (D-Nelson v. R-Scott), Indiana (D-Donnelly v. R-Braun), and Tennessee (D-Bredesen v. R-Blackburn).
Not counting these races, Democrats are favored to end up with 46 seats, Republicans with 48. To take control, Democrats would have to win five out of the six knife-edge races. This is a tall order but not at all impossible. Races that look close at this point in the season tend to end up breaking in the same direction. For a probabilistic look, see David Byler’s Senate election model.
In addition, one might keep an eye on the Arizona and New Jersey races, though I think Democrats will likely win both. Conversely, Texas is still looking like a Republican hold, at least for now.
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After you’re done donating, you can also look for a place to campaign near you. Door-to-door campaigning is by far the most effective known way of increasing turnout. Swing districts are all over the United States, as you can tell by looking at our 2018 Competitive District Finder.