Mr. Giordano's Senate run may be the target of another federal inquiry.

O'Donnell's 2010 Senate run was her third try for the office in five years.

The public's general weariness of Mr. Clinton is the more serious problem for her Senate run.

He received 639 votes as a presidential candidate and 9,877 in his Senate run.

He also has a sizable war chest to sustain a Senate run.

Not only did he devote months to mulling the pros and cons of a Senate run, he said.

The warrant was still outstanding at least as of the time of Martin's 2008 Senate run, but he said the issue is being "resolved."

In 1987, he set his sights on a Senate run and handily garnered a seat.

Mr. Giuliani asserts that his emphasis on education is neither new nor an attempt to set the stage for a Senate run.

If he lost this Senate run, or just got sick of politics, he probably could make a living as a writer of some kind.