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.
Ensign (ENS, O1) The initial Commissioned Officer rank held by graduates of the United States Naval Academy (USNA), Navy Reserve Officer Training Corps (NROTC), Officer Candidate School (OCS) and other commissioning sources. Generally, most Ensigns are in various schools training for their respective warfare or staff specialties.