| Clue | Source | Date |
|---|---|---|
| Engage in a quid pro quo, politically | Universal | 31 Jul 2021 |
| Participate in quid pro quo | New York Times | 19 Oct 2018 |
| Participate in quid pro quo | ||
| Act of political backscratching | Universal | 16 Oct 2016 |
| Engage in some congressional quid pro quo | The Washington Post | 31 Jul 2016 |
| Engage in vote swapping | Newsday | 06 Mar 2016 |
| Engage in vote-swapping | ||
| Engage in vote-swapping | ||
| Backscratch, politically | ||
| Engage in vote-swapping | ||
| Work together for mutual political gain. |