on the stump

If politicians are on the stump, they are travelling to different places and speaking to voters as part of their election campaign. This expression is used mainly in American English, but is becoming more common in British English.

He began appearing frequently on the stump and in one celebrated incident mounted a soapbox and grabbed a megaphone to shout down hostile demonstrators.

Despite his falling popularity, the president braved it on the stump today on behalf of his fellow Republicans.