A lopsided map, heated primaries, and Trump: Where the 2018 Senate races stand today
Donald Trump
Donald Trump

(Donald Trump.Yuri Gripas/Getty Images)

At first glance, some of 2018's most pivotal elections look very promising for Republicans.

Democrats have to play defense — big league. Of the 11 Senate seats the party controls in states President Donald Trump won in 2016, ten senators are up for reelection in the upcoming vote.

"When you look at our incumbents, I mean, our third most competitive state this cycle is Texas," a Republican close to the campaign process told Business Insider. "So it definitely is a good place to be."

But take a step back from the promising map, and Republicans are faced with a litany of outside challenges.

As it is, the GOP is taxed with a number of key issues this early in the cycle that could prove to be detrimental in the months of campaigning ahead: A potentially risky vote on unpopular healthcare legislation, a number of already bruising primaries, a number of top contenders deciding against entering the race, and — possibly the most important factor — where Republicans stand with Trump, who has routinely seen his approval rating dip into the 30s.

"When Trump won, I think one had to immediately downgrade Republican prospects even while acknowledging their excellent list of targets," Kyle Kondik, managing editor of Sabato's Crystal Ball at the University of Virginia Center for Politics, told Business Insider in an email. "I don't think anything is certain, but it remains the case that if the Democrats avoid a net loss that would be a significant victory, and Republicans could make a small Senate gain even under poor conditions next year."

Terry Sullivan, who served as campaign manager for Republican Sen. Marco Rubio's 2016 presidential campaign, echoed Kondik, pointing to the Democrats having "some very strong candidates" who are "tailor made" for the states they're running in, even as the map proves daunting.

"And, they've got a hell of a tailwind, given the environment," he added. It's "a cat's game in the Senate."

The map

The specific seats up for grabs are the Democrats' "biggest problem," Kondik said. Some of those races are in traditional Democratic states that Trump won by slim margins in 2016, such as Michigan, Pennsylvania, and Wisconsin. Others are in states like West Virginia, North Dakota, Indiana, and Missouri — states in which Trump defeated Democratic presidential nominee Hillary Clinton by anywhere from 19 to 42 points.

A total of 34 seats are up for grabs, and 25 of them are currently occupied by Democrats or independent senators who caucus with the party. Just one of the Republican seats — Nevada's — seems to have a very real shot of flipping, although some consider Arizona to be very much in play, while Democrats believe Texas is on the table, too.