It will all come down to the fight to control the Senate.

And the Democrats’ chances of winning a majority took a modest step forward last week when former Colorado governor John Hickenlooper ended his campaign for the Democratic presidential nomination and signaled he was considering taking on Republican Sen. Cory Gardner. While there are already other potentially strong Democrats in that contest, polls show Hickenlooper leading Gardner by double digits.

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If Democrats won the White House, they would need a net three-seat gain to control the Senate with the vote of a Democratic vice president. It’s difficult to imagine this happening without the defeat of the three most vulnerable Republican incumbents, Gardner and Sens. Susan Collins (R-Maine) and Martha McSally (R-Ariz.). Alabama Sen. Doug Jones (D) faces a very tough reelection campaign in a deeply Republican, pro-Trump state. A Jones loss would move the Democrats’ victory line to four pickups.

Their chances of getting there depend in part on whether Montana’s Democratic Gov. Steve Bullock decides to end his own presidential candidacy to take on Republican Sen. Steve Daines. It’s hard to see any other Democrat beating Daines. Bullock — as he never tires of pointing out — has shown he can run far ahead of his party’s ticket. Bullock has insisted he doesn’t want to be a senator, but Democratic Senate strategists, with an accent on hope, sense a softening in Bullock’s stance on the Senate.

Hickenlooper’s decision to withdraw points to two important dynamics in the Democratic presidential race. The first is that former vice president Joe Biden is blocking the emergence of any other moderate or center-left candidate. Absent a Biden collapse in the next few months, there will be little room for candidates such as Sens. Amy Klobuchar of Minnesota or Michael F. Bennet of Colorado.

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It was striking that a Quinnipiac University poll this month found that Biden was winning just 19 percent of Democrats who said they were “very liberal” and 28 percent who called themselves “somewhat liberal.” But he was taking 43 percent among those who called themselves moderate or conservative.

This leads to the other dynamic: Aggressively taking on the left, as Hickenlooper did, is not, for now at least, a winning strategy for more moderate presidential candidates. This is partly because their real competition comes from Biden but also because progressive Democrats have shown themselves far more open to moderate candidates in Senate and House races than in the presidential race. Progressives have been willing to make pragmatic judgments about who is best positioned to win a given Senate or House seat but want to make a strong statement in the presidential contest. Thus, in the same Quinnipiac poll, Sen. Elizabeth Warren (D-Mass.) led Biden by more than 2 to 1 among very liberal Democrats.

It’s notable that in his dignified withdrawal video, Hickenlooper stressed three issues that appeal across the Democrats’ moderate/liberal divide and also to swing voters: lowering prescription drug costs, dealing with climate change and taking action on guns. He sounded like a Senate candidate.

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If Senate Democrats are hopeful that Hickenlooper and possibly Bullock could help them take the Senate, they are also looking to what they call “the Heller Effect” to get them the rest of the seats they need. In 2018, Nevada’s Republican Sen. Dean Heller lost in part because he was cross-pressured between showing support for Trump to rally his Republican base and demonstrating independence from Trump to attract middle-of-the-road voters.

This political inconstancy didn’t work for Heller, and Democrats think the same neither-one-thing-nor-the-other dynamic could hurt Republican Sens. Thom Tillis in North Carolina and Joni Ernst in Iowa — as well as Gardner, Collins and McSally. Tillis was already embarrassed earlier this year when he wrote a Post op-ed opposing Trump’s emergency declaration to build a border wall and then turned around and voted with Trump on the same issue. His flip-flop left both sides unhappy.

As for Hickenlooper, he often seemed uncomfortable as a presidential candidate but was eloquent whenever he talked about his bipartisan achievements as governor of Colorado. It’s an approach that could serve him well as he heads home.

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