What does Alabama Senate race mean for 2018?

Senate Republicans lost one of their Alabama seats this week and are attempting to pass an unpopular tax bill. Both may have an effect on the party's success in 2018 midterms.
3:00 | 12/17/17

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Transcript for What does Alabama Senate race mean for 2018?
As we head into the holidays, it sure looks like president trump and the GOP will get what they want for Christmas. The votes lined up for the largest tax cut in years. What will it mean for the economy and the middle class? That may take years to determine. We'll have two of America's prominent economists ahead. Will it look like a win one year from now? This is where it all began. Reporter: This time last year, Donald Trump was thanking Alabama voters. On his victory tour. Not this week. Despite the president's late push for the GOP candidate doctor. Get out and vote for Roy Moore. Do it. Do it. Reporter: Moore's baggage was just too heavy. The leader of the party, I would have liked to have had the seat. Reporter: And trump's clout a little light. The president won Alabama by 28 points. Now his approval rating is below 50 in the reddest of red states. He's caught in a cross fire of a GOP civil war. With Steve Bannon. To Mitch Mcconnell and senator Shelby, there's a special place in hell -- -- For Republicans who should know better. Reporter: Waging an all-out assault on the Republican leaders in congress who the president needs to work with every day. For Democrats, Tuesday the best day of 2017. We have come so far. And the people of M bm have spoken. Reporter: Young people, African-Americans, women, energized by trump and the me too movement made Doug Jones the first democratic senator from Alabama in 25 years. And gave Democrats hope that taking back the senate just might be possible. The midterm map favors Republicans. Ten from states that went to trump last year. Only eight Republican seats run for alex. And the pop is betting their new tax bill is the insurance policy they need. Jobs are going to come pouring back into this country. Which we need very much. Reporter: Convince T that defeat on the tax bill would doom them in 2018, Mitch Mcconnell, Paul Ryan, and the president are pulling out all the stops. Everybody will benefit. I think the greatest benefit will be for jobs and the middle class. Reporter: Independent analysts show the big winners are corporations and the wealthy. Polls show less than a third of the country supports it. One of the most unpopular bills in years. It has Democrats hoping that the ledge shative defeat they saw this week will reap big in the next year.

This transcript has been automatically generated and may not be 100% accurate.

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