U.S. Senate

The groups' targets? Democrats undecided on whether to accept or reject the deal when they vote this fall. The campaigns include tens of millions of dollars spent on TV ads in nearly two dozen states.

Marine Gen. Joseph Dunford said that Moscow poses the greatest threat to U.S. national security and that Ukraine requires U.S. arms to counter Russian aggression.

The bill still must clear the House. The measure would clear the way for President Obama's Trans-Pacific Partnership, which is unpopular with labor groups and some Democrats.

On the committee level in the Senate, Republicans and Democrats have been able to get deals done. The problem will be what happens after bills leave the committees and head to the Senate floor.

If this Senate is getting some traction, it's not yet a threat to anyone's legislative hall of fame. Much higher hurdles loom, including highway funding, spending bills and the debt ceiling.

The senator who once testified against a corrupt mayor is facing his own federal corruption charges.

The indictment of Sen. Robert Menendez, D-N.J., could lead to Chris Christie, R-N.J., appointing a replacement. With Christie's presidential prospects, he might want to consider appointing himself.

Democrats argue the top Senate leader's retirement might be a good thing. But it's going to set off a scramble to replace him in one of the most hotly contested races in 2016.

Vice presidents have cast 244 tiebreakers in the Senate, but if Biden rescues Loretta Lynch's bid, it will be the first time it has been used for a Cabinet nomination.

Brooke was the first African-American to be popularly elected to the U.S. Senate, serving in the chamber for 13 years. He was a major champion of fair housing laws.

The Center for Public Integrity calculates that KTUU in Anchorage ran more U.S. Senate ads this cycle than any station in the country.

The balance of power in the House and Senate could be upended with Tuesday's vote. We break down some of the key themes and offer a few predictions.