Welcome to Pollapalooza, our weekly polling roundup.

Poll of the week

For some time, the conventional wisdom (and I largely agree with it) around the upcoming midterms has been that Democrats are modest favorites to win the House, while Republicans are likely to hold the Senate. Democrats, who have 49 Senate seats at the moment, might win GOP-held seats in Arizona and Nevada, but it seems likely they’ll lose at least one of the 10 seats they hold in states that President Trump carried in 2016.

But the 2018 Senate map is shifting — mostly in ways that make it more likely that Democrats could flip that chamber too. If you’ve only been paying attention to the House, it’s time to check back in on the upper chamber.

Our poll of the week, for example, comes from Tennessee. In the race to replace retiring Republican Sen. Bob Corker, Democrat Phil Bredesen (Tennessee’s former governor) leads GOP Rep. Marsha Blackburn 45 percent to 35 percent, according to a Middle Tennessee State University poll of 600 registered voters. (Blackburn and Bredesen are almost certain to win their respective parties’ primaries in August.) Seventeen percent of voters were undecided.

A poll in December showed the two effectively tied, so this MTSU survey could be an outlier. And I’m skeptical Bredesen will win by double digits in ruby-red Tennessee, where Trump won by 26 percentage points in 2016. But at the same time, Bredesen has deep roots in the state. He was the mayor of Nashville, and then got himself elected governor twice (in 2002 and 2006), winning his re-election campaign by 39 points. Blackburn is likely to run as a Trump ally, but the president is not as popular in Tennessee as you might think, considering his margin of victory there in 2016: He’s only barely above water, according to most surveys. The MTSU poll put his approval rating in the state at 50 percent, with 41 percent disapproving. Morning Consult had him at 55-41 in March. And Gallup, aggregating all their 2017 tracking polls, put him at 50-44.

All of which is to say that Bredesen has a real chance — and Democrats could pick up a seat in the South that, not long ago, looked unwinnable. If a Democrat is going to win a statewide federal race in Tennessee in the foreseeable future, this is probably the time, when all the conditions are right: an open seat (i.e. no incumbent, and especially no incumbent Republican), an unpopular GOP president with lukewarm support even in the Volunteer State, and a strong Democratic candidate.

Meanwhile, Arizona could have two Senate seats up for grabs this November.

It’s been clear for a while that Democrats might take one of Arizona’s seats, with incumbent Republican Sen. Jeff Flake retiring. But — and look, it’s uncomfortable to discuss this — Sen. John McCain’s health now has major political implications as well. McCain, who has represented Arizona in the Senate for more than three decades, is suffering from brain cancer and has not been on Capitol Hill since December. If McCain resigns or passes away before May 30, Arizona Gov. Doug Ducey, a Republican, would appoint a temporary replacement. But there would be a primary in August for the seat and an election in November.

About half of Arizona voters approve of Trump and half disapprove, according to the recent Morning Consult poll. Trump won the state by less than 4 points. Arizona isn’t all that red, in other words. And if there are two open seats, the chances are that much higher that at least one of them will feature an uber-conservative GOP nominee, which might make it hard to win a general election. In the race for the Flake seat, the GOP establishment has coalesced around U.S. Rep. Martha McSally, who is running in the Republican primary against the tea party-aligned Kelli Ward and former Phoenix-area sheriff Joe Arpaio, who was convicted of criminal contempt for refusing to follow a judicial order to stop racially profiling and detaining Latinos. (Arpaio was pardoned by Trump last year.)

If the McCain seat is open, Arpaio, Ward or another candidate who might be too conservative for the state could switch to run in that race instead. It may be hard for more establishment Republicans in Arizona to lock the anti-establishment wing of the party out of both seats.

Like in Arizona, Democrats are often enthusiastic about their chances in Texas but almost always lose in federal statewide races there. That said, Democratic congressman Beto O’Rourke outraised incumbent Republican Sen. Ted Cruz in the last quarter of 2017. And O’Rourke raised even more cash in the first quarter of 2018, a sign he’s waging a serious campaign.

We don’t have any recent polls of this race, but it’s worth watching. Cruz has the advantage; Texas is still unquestionably a red state, after all. But his re-election can’t be taken for granted anymore. Case in point: The Cook Political Report moved the race from “solid Republican” to “likely Republican.” So did CNN.

So Democratic prospects are looking better in Tennessee, Arizona and Texas. There is one race, though, where the outlook seems to be improving for the GOP: Florida. Gov. Rick Scott, a Republican, officially announced this week that he is challenging Democratic Sen. Bill Nelson. Everyone already knew Scott was going to run for the seat, but in such a Democratic-leaning environment, it’s gotta be a little reassuring for Republicans that a strong candidate like Scott officially took the plunge. Florida is about evenly divided between the two parties, so this was always going to be a close race, and polls have suggested Nelson and Scott are running neck and neck.

The race may have even gotten a bit tighter in recent weeks, as only one of those polls was in the field after Scott signed a set of gun control measures into law last month in the wake of the school shooting in Parkland, Florida. That was a high-profile move, and one that might appeal to more moderate Florida voters in both parties.

Other polling nuggets

Trump’s approval rating

Trump’s job approval rating is 40.6 percent; his disapproval rating is 53.3 percent. Last week, his approval rating was 40.2 percent, compared with a disapproval rating of 53.8 percent.

The generic ballot

The Democrats hold a 46.2 percent to 39.6 percent advantage on the generic congressional ballot this week. Last week, Democrats were up 47.1 percent to 39.1 percent.

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