Which means that the contest for the Senate, which Republicans now control by a 53-to-47 margin, will be nearly as important as the presidential race.

Democrats just got a particularly intriguing candidate to run for one of the small number of vulnerable Republican seats: Mark Kelly, former astronaut, gun safety advocate and husband of former congresswoman Gabrielle Giffords, announced that he’ll be running in Arizona for John McCain’s old seat, which is held by Martha McSally. She was appointed to fill it after narrowly losing her race for the state’s other seat to Kyrsten Sinema. Take a look at Kelly’s moving video:

If we take this as representative of the kind of campaign Kelly will run, it’s notable for a number of reasons. In some ways it’s the standard biographical introduction to the candidate — telling about his parents, his pre-political career and the assassination attempt on Giffords that set him on this course.

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But there are some things you don’t hear in this video. The word “Democrat,” the party Kelly belongs to, is never spoken. He talks about issues that are important to Democrats, but in only the most general terms:

“Access to affordable health care, the stagnation of wages, job growth, the economy. You know, as the climate warms we’re going to have more drought here in the desert. Solving some of the hardest problems requires one thing, and that’s teamwork. Partisanship and polarization and gerrymandering and corporate money have ruined our politics. And it’s dividing us.”

Arizona is a state that was red, is now purple and is moving toward blue, but very slowly; Donald Trump beat Hillary Clinton there by three-and-a-half points, and Sinema beat McSally by two-and-a-half points. So it isn’t surprising to see Kelly begin with a message of unity and bipartisanship. Nevertheless, the prevailing sentiment in the Democratic Party is that the way to win is less by reaching across the aisle and more by motivating Democrats to turn out. That may turn out to be where Kelly puts his emphasis eventually, but he’s not leading with it. As of yet we have no idea what he thinks about Medicare-for-all, a Green New Deal or any of the other policy questions that the party is debating.

But there’s something else that’s unusual about Kelly: His public profile is defined in large part by his relationship to his wife, which is almost unprecedented for a male politician in America. It has worked the other way around on many occasions, usually after the husband died, but not when the wife was elected first.

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In fact, the only previous instance in U.S. history in which a man followed his wife to Congress was 70 years ago: Rep. Emily Taft Douglas (D-Ill.) was elected to the House in 1944, and her husband, Paul Douglas, was elected to the Senate four years later.

Obviously, Kelly and Giffords’s circumstances are unique. Giffords survived being shot in the head and became a national figure during her recovery, and the couple quickly became the country’s most prominent spokespeople for the gun safety movement. That activism, the years they’ve spent campaigning for candidates who shared their beliefs on guns, and Kelly’s experience in the Navy and at NASA mean he isn’t a neophyte when it comes to government and politics.

But he has never run for anything before, and while astronauts are semifamous in their own right, Kelly is still defined in the public’s mind as “Gabby Giffords’s husband.” Their high profile and the admiration people have for them as a couple were no doubt the reason many Democrats encouraged Kelly to run (though others, including Rep. Ruben Gallego, are also considering joining the race). Kelly’s introductory video not only spends a good deal of time on his relationship with his wife, but you’ll notice something else: He talks about the experience his mother had overcoming obstacles to become a police officer, but doesn’t mention that his father was a police officer, too.