In 2012, candidates needed either one percent or 500 signatures (whichever was lower) from Democrats in each of the state's 50-plus congressional districts. They had two months to do so -- which, particularly if you're hoping to keep expenses under $5,000, is a time crunch. Other states work similarly; some don't.
A contemporary definition of rank-and-file is prevalent in labor union vernacular when referring to general membership and not union leaders. Rank-and-file generally means the employee doesn't occupy a high-level position within the organization.
Filing cabinet. A filing cabinet (or sometimes file cabinet in American English) is a piece of office furniture usually used to store paper documents in file folders. In the most simple context, it is an enclosure for drawers in which items are stored. The two most common forms of filing cabinets are vertical files and lateral files. A vertical file cabinet has drawers that extend from the short side (typically 15 inches) of the cabinet. A lateral file cabinet has drawers that extend from the long side (various lengths) of the cabinet.