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With President Trump's base support beginning to erode and a Republican-held Congress failing to achieve any of its chief policy aims, the stage seems set for a Democratic takeover of the legislative branch in 2018. But Democrats are staring down one huge obstacle: the Senate map.

Expand chart
Data: Dave Leip's Election Atlas, U.S. Senate; Chart: Andrew Witherspoon / Axios

The problem: 25 Senate seats currently held by Democrats or independents caucusing with them are up for election in 2018 — more than half of the Democratic caucus. Even more significantly, 10 of those seats are in states that voted for Trump in 2016. Conversely, just eight Republican seats are up for election with only one in a state that went for Hillary Clinton.

Think of it this way: 538 presented a scenario that should terrify Democrats: it took Iraq, Katrina, the start of the Great Recession and rock bottom approval ratings for George W Bush for the Dems to grab a 60-seat Senate supermajority in 2008. But 30 states went for Trump in 2016, meaning the GOP would just need to nab both senators from those states in order to attain a supermajority — not unthinkable in today's hyperpartisan, straight-ticket environment.

It's not over — yet: A RealClearPolitics analysis showed that — while 2018 is certainly bad for Democrats — next year's map isn't historically bad. Based on trends, Democrats are likely to lose a few seats, but that might put them in a better spot with a more favorable map and a presidential race in 2020. It's also worth noting that Democrats managed to pick up two seats, in Missouri and Indiana, with the same map in 2012.

Three things in Democrats' favor:

  • A sense of where things went wrong: The Trump era has led Democrats, especially those hanging on in midwestern states, to recalibrate their priorities. A Politico profile from earlier this year showed how Wisconsin Sen. Tammy Baldwin is reaching out to dairy farmers by decrying almond milk and Ohio Sen. Sherrod Brown has made the opioid crisis a focal point of his tenure.
  • A lack (right now) of high-profile challengers: Of those 10 Democrats up for reelection in states that Trump won, only two — West Virginia Sen. Joe Manchin and Pennsylvania Sen. Bob Casey — have declared opponents who have previously held federal office.
  • Trump's continuing unpopularity: Trump's approval ratings among all voters remain at historically low levels for a modern president, and Axios reported over the weekend that Trump is also seeing his GOP base erode in key swing states.

Go deeper

G20 coal impasse previews fraught UN climate summit

A man tends to vegetables in a field as emissions rise from nearby cooling towers of a coal-fired power station in Tongling, Anhui province, China, Jan. 16, 2019. (Qilai Shen/Bloomberg via Getty Images)

G20 environment ministers ended talks without agreeing to phase out domestic coal-fired power generation and funding for such plants abroad, a deadlock that foreshadows difficult negotiations looming for this fall's critical climate summit.

Driving the news: Officials who met in Naples, Italy, on Thursday and Friday could not find consensus language on the use and financing of the most carbon-emitting fuel.

Updated 2 hours ago - World

At least 125 dead in western India after landslides, monsoon flooding

Vehicles driving through a flooded street in Mumbai on July 19. Photo: Pratik Chorge/Hindustan Times via Getty Images

At least 125 people are dead after monsoon rains triggered landslides in the western Indian state of Maharashtra, authorities said on Saturday, according to Reuters.

State of play: Downpours lasting several days have impacted hundreds of thousands of people, as major rivers are in danger of breaking through their banks.

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