The race for control of the U.S. Senate in 2020 is officially underway in the key swing state of New Hampshire. On Monday, Brig. Gen. Don Bolduc (retired) formally announced his candidacy in what is likely to be a hotly contested GOP primary and will undoubtedly be a competitive general election against incumbent Democrat Sen. Jeanne Shaheen.

“Why can’t the people in Washington, D.C., get it right?” Bolduc asked an enthusiastic Republican audience. “Because they’re the wrong people.”

Shaheen’s 2020 re-election bid is consistently featured in political analysis as a potential pickup for the GOP next year. Given the current map and the size of the GOP majority (53-47), a Democratic loss in the Granite State would all but assure Republicans maintain control of the Senate.

At first blush, the 2020 Senate map looks good for Democrats. You have an unpopular president credited with the 2018 Blue Wave that brought Nancy Pelosi back into power and Republicans have to defend far more Senate seats (22) than Democrats do (12).

But on closer inspection, the odds of Democrats taking control of the Senate look much less promising. Nearly all of those Republican incumbents are in safe or strongly leaning GOP states. Only two are in states Trump lost: Sen. Cory Gardner in Colorado and Sen. Susan Collins in Maine.

Democrats need to flip four seats to win 51 and take an outright majority. If a Democrat wins the White House, then 50 will do, with Vice President Buttigieg (?) breaking any ties. As of now, however, just three states are rated toss-ups by University of Virginia political seer Larry Sabato — Alabama, Arizona and Colorado. And the most vulnerable senator of the three is a Democrat, Alabama’s Doug Jones.

“There’s always a chance Democrats could do it, but three takeaways at this point is improbable,” Suffolk University’s director of polling David Paleologos tells InsideSources. “Not impossible, but improbable.”

And while political fortunes are fluid and the 2020 election is more than 17 months away, if Democrats are counting on President Trump’s unpopularity dragging down the GOP’s Senate majority, Paleologos’ latest polling on that front isn’t good news, either. As USA Today reports:

“In the poll, 49 percent expressed approval of the president, while his disapproval rating was 48 percent. It was Trump’s highest approval rating in the USA TODAY/Suffolk Poll and the first time in more than two years that the president had a net positive approval rating.”

In poll after poll, Trump’s national approval continues to hover around 44 percent. Not great — but not low enough to undermine solid GOP incumbents in their home states, either.

And then there’s Susan Collins of Maine. She’s been a top target of progressive Democrats since her vote to confirm Brett Kavanaugh to the Supreme Court. Activists have already contributed more than $4 million to an ActBlue fund dedicated to her defeat. On Monday, Maine Speaker of the House Sara Gideon announced her candidacy, and she hit the ground running with endorsements from the state attorney general and state Senate majority leader. In a state where President Trump is currently underwater by nine points, that’s all good news for Democrats.

Yet Collins is still considered the frontrunner, in part because she’s faced similar odds in the past and always come out on top. She first won her seat in 1996, a terrible year for Republicans both nationally (incumbent Bill Clinton crushed the hapless Bob Dole) and in Maine where Clinton won by 21 points.

“It’s virtually impossible to see a map where Democrats win a majority in the U.S. Senate but don’t win Maine,” Sarah Dolan, executive director of the conservative group America Rising, told InsideSources. “After a string of recruitment failures, Chuck Schumer and the DSCC are now pinning all their hopes for a majority on candidates like Sara Gideon who are untested on a national stage and are going to face a level of scrutiny unlike anything they’ve seen before.”

Those “recruitment failures” include Iowa, where Democrats were hoping popular former Gov. Tom Vilsack would challenge Sen. Joni Ernst, but he declined. Thus far no major Democratic contender has stepped forward.

In Colorado, Democrats at the local and national level are pressuring 2020 presidential candidate Gov. John Hickenlooper to abandon his long-shot bid for the White House and take on GOP incumbent Sen. Gardner. Thus far their efforts have had little effect other than to annoy the former governor.

“If the Senate’s so good, how come all those senators are trying to get out?” Hickenlooper said of other senators now aiming for the White House.

Some Democrats still hold out hope that Hickenlooper will change his mind and make a run for the Senate, along with Beto O’Rourke in Texas and Montana’s Gov. Steve Bullock. But as data analysts at FiveThirtyEight observed, while their chances of winning a Senate seat are better than becoming president — they’re still long odds.

If there’s a candidate in this cycle with the political skills to pull an upset, it appears to be a Republican: John James of Michigan. The African-American business owner and combat veteran was a virtual unknown when he announced his run against incumbent Sen. Debbie Stabenow in 2018 but ran a competitive race, losing by just 6.4 percent amid a national blue wave. Now he’s running against Sen. Gary Peters. An Emerson poll in March showed James in a dead heat with the incumbent Democrat.

What Democrats need to make Sen. Chuck Schumer the next majority leader is a couple of standout candidates who can overperform in key red or purple states and a massive blue wave to push them over the top. They haven’t gotten the former and there’s no guarantee of the latter.

“I hate to say it, but if I had to bet today, I think the GOP picks up a seat,” one Democratic strategist told InsideSources. “Without our red-state superstars (like Bullock and O’Rourke), this map really works against us.”

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Michael Graham is Boston-based political editor at InsideSources.com.