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.
The  25 numbered ranks in Ranked play. Ranked (also known as Ranked Play) is the serious side of Play mode, with players able to earn special ranks to reflect their prowess in battle this season. Winning and losing matches can gain or lose players rank, with the player's rank determining matchmaking.