Hillary and Barack have no love lost:

WASHINGTON, Aug. 4 — They work in the same building. They slog through the same rigorous travel schedule. Along the way, they often cross paths several times a day.

But Senators Hillary Rodham Clinton and Barack Obama have barely spoken to each other — at least in any meaningful way — for months.

The tension between the two Democratic presidential hopefuls, which has spilled into public view in the last three weeks, has been intensifying since January. It is clear that the genteel decorum of the Senate has given way to the go-for-the-jugular instinct of the campaign trail.

As the Senate held late sessions of back-to-back votes before its summer break, the two rivals kept a careful eye on each other as they moved across the Senate floor. For more than two hours one night, often while standing only a few feet apart, Mrs. Clinton and Mr. Obama never approached each other or exchanged so much as a pleasantry.