run against

1. Also, run up against or run into . Encounter something, especially a difficulty, unexpectedly. For example, We didn't know we'd run up against so much opposition , or He ran into trouble with his taxes . [Late 1300s]

2. Work against, as in Public sentiment ran against her . [Late 1300s]

3. Oppose for elective office, as in Susan decided to run against a very popular incumbent . This usage is a figurative application of running in a footrace. [First half of 1800s]