n.campaigning for something by making political speeches (stump speeches)

stumping:
Stumping e-rater :challenging the validity of automated essay scoring
Stumping Experiment of 4 Desert Shrubs in South Margin of Tengger Desert
Stumping on the Internet 2008 Presidential Primary Candidate Campaign Webpages
Management of root diseases by stumping and push-falling.
Stumping effects on number and distribution of roots of Caragana microphylla Lam.plantations
Impacts of two stumping operations on site productivity in interior British Columbia
STUDY ON TECHNOLOGY OF STUMPING AND REJUVENATING OF HIPPLPHAE RHAMNOIDES LINN
The use of treeshelters and application of stumping in the establishment of walnut (Juglans regia).
Improving the Rooting Capacity of Stem Cuttings of Virginia Pine by Severe Stumping of Parent Trees.