In 2018, even the smallest shake-up to any single Senate race could be the difference in determining which party holds majority control come January 2019. And President Donald Trump’s agenda hangs in the balance. A Republican Senate could repeal Obamacare, secure funding for a border wall and undo hundreds of environmental regulations. A Democratic Senate, on the other hand, could spend 2019 ensuring that Trump is a one-term president.

Following Republican Roy Moore's historic upset defeat in Alabama, Democrats are giddy at the prospect of stealing another seat in a GOP stronghold. Meet Kelli Ward, a conservative former state senator running for the Republican nomination in the 2018 Arizona Senate race to replace the retiring Senator Jeff Flake, a seat the GOP once considered safe.

After spending 2017 under the radar, former President Barack Obama has an ambitious 2018 ahead, planning to traverse the country in support of Democratic candidates up and down the ballot. But don't call it a comeback, because Obama knows it's no longer his turn. He's passing the baton. "President Obama wants to help Democrats win," Eric Schultz, senior adviser to Obama and former White House principal deputy press secretary, told Newsweek. "But he also knows the best way to rebuild the Democratic Party is to help support the next generation of leaders."

Josh Hawley, the Republican frontrunner in the Missouri Senate primary to take on Democratic incumbent Senator Claire McCaskill, garnered headlines Wednesday after it was revealed that he connected the issue of sex trafficking with the sexual revolution of the 1960s and '70s.

The Republican Party is hoping that its recently passed tax bill will improve its favorability and help its standing going into the 2018 midterms. If a survey released Wednesday is any indication, the GOP needs a lot of help. A new CNN poll gives Democrats an 18-point lead on a generic 2018 congressional midterm ballot over their Republican counterparts.

President Donald Trump spent much of his campaign promising to bring back coal, an industry that he said then-President Barack Obama had demoralized with too many regulations. So in July when Trump declared at a rally that he had created 45,000 coal jobs since the start of his presidency, many coal miners rejoiced.

An Arkansas Republican who garnered national attention in 2014 for declaring her gun range a "Muslim Free Zone" is running for governor against incumbent Republican Governor Asa Hutchinson. Jan Morgan, who has served as national spokesperson for Citizens for Trump, officially announced her candidacy at a New Year's Eve event in her hometown of Hope Springs, Arkansas, though she created a campaign website and began soliciting campaign contributions earlier in 2017.

Months after being pardoned by President Donald Trump following his conviction on charges of criminal contempt, Sheriff Joe Arpaio announced Tuesday that he is running for the Arizona Senate seat left vacant by the retirement of Senator Jeff Flake. The 85-year-old former lawman is best known nationally and in Arizona for his conservative stance on undocumented immigrants and his controversial law enforcement tactics during his time as Maricopa County sheriff.

Republican Congresswoman Martha McSally joined the already crowded Arizona Senate GOP primary Friday morning by releasing a video already making the rounds on Twitter. McSally, who has been perceived by those handicapping the race as the Republican establishment's top choice, appears instead to be catering to a more conservative primary electorate.

Billionaire hedge fund manager and leader of the "Need to Impeach" campaign to impeach President Donald Trump said Wednesday that he would not donate any money to the three main campaign arms of the Democratic Party following the decision by Senate Democrats to compromise on a deal to reopen the government. Steyer told Fortune magazine that he would not be giving any money to the Democratic National Committee, the Democratic Senatorial Campaign Committee or the Democratic Congressional Campaign Committee.