In a race that was once a dead heat, Republican Joni Ernst has pulled ahead of Democrat Rep. Bruce Braley, even as Democrats in states like North Carolina prove less vulnerable than strategists once thought.
From Kentucky to Alaska, GOP Senate candidates argue that a vote for a Democrat is a vote for majority leader Harry Reid. Cast your ballot for the Republican, and you can flip the Senate and dump the dictator, they say.
Campaign spending by 'dark money' groups is eight times higher than about this time in the last midterm campaign cycle, and it's mainly going to TV ads in races that could tip control of the US Senate.
Coal is the gold standard in West Virginia, where Senate candidate Natalie Tennant bashes her GOP rival for appearing on the campaign trail with out-of-stater Mitt Romney, who once said coal 'kills people.'
In 2010 and '12, Democrats funded ads to topple GOP 'establishment' candidates before they could get to a general election. But this year Republicans saw it coming in Alaska, and 'establishment' favorite Dan Sullivan is campaigning on it.
The tea party failed to beat the vulnerable Sen. Pat Roberts of Kansas, but it did fend off an establishment challenge against two influential House members. The big takeaway: candidate quality matters.
For voters, a senator with a home away from home can signal selling out to Washington. Milton Wolf, a distant relative of the president, is using that argument against Sen. Pat Roberts in Tuesday's Kansas Republican primary.
Top Democrats in Colorado this week managed to keep two antifracking measures off the ballot – initiatives that could have caused Sen. Mark Udall (D) all sorts of difficulty in his tight reelection bid.
Businessman David Perdue won Tuesday's GOP Senate primary in Georgia, defeating US Rep. John Kingston. Georgia is a red state, but rise of minorities, who tend to vote Democratic, gives Michelle Nunn a better-than-usual chance.
Calling unmarried women an undermobilized electorate, Democracy Corps touts a populist message to close the gap against Republicans in 12 Senate battleground states, most of them traditionally conservative.
In Tuesday's runoff, voters decide which Republican candidate goes up against Democrat Michelle Nunn, who has polled well in the Georgia Senate race. A US congressman leads a businessman in the race to take her on.
The Mississippi Republican primary between Sen. Thad Cochran and tea party-backed Chris McDaniel has been ugly and could get worse. Ted Cruz is jumping in, and McDaniel is moving toward a legal challenge.
Tea party challenger Chris McDaniel and his supporters are refusing to acknowledge that they lost a Mississippi Republican primary runoff to Sen. Thad Cochran, meaning an already-weird race is getting weirder by the day.
Sen. Thad Cochran could not have won the Mississippi Republican primary without thousands of black voters, mostly Democrats, in an open primary. Opponent Chris McDaniel is steamed, but others may learn a lesson.
Sen. Thad Cochran (R) of Mississippi prevailed Tuesday in the GOP primary against tea party challenger Chris McDaniel. He pulled off the upset with help from black Democratic voters and GOP establishment figures.
Sen. Thad Cochran is facing a tight runoff Tuesday in the Republican primary with the tea party-backed Chris McDaniel. Looking for an edge, he's appealing to African-American voters. It's a tactic that has raised eyebrows.