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.
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.
Outside groups backed by the Koch brothers on the right and environmentalist billionaire Tom Steyer on the left are pumping millions into a race that tests whether climate issues can play well for Democrats in moderate states.
Suddenly, N.H. Sen. Jeanne Shaheen (D) and former Mass. Sen. Scott Brown (R) are only two points apart. The last Granite State Poll had them 12 points apart. But the shift may not be as big as it seems.
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.
At an emotional meeting in Chicago, the Republican National Committee steered clear of 'race-baiting' allegations in Mississippi's GOP Senate runoff. But the issue of how Republicans reach out to blacks is very much alive.
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.