Jonny and the Baptists are touring the UK in advance of the election on 7 May, with Rock the Vote, a show that reprises half its material from their 2014 Edinburgh act. Besides making you laugh, its stated aim is to bring out the vote – unless you’re a Tory (welcome to Windsor!), in which case it’s to trick you into thinking the election is on 14 May.

It’s good fun: Jonny Donahoe (on big bluesy voice) and Paddy Gervers (on guitar) make effective, emphatic comedy songs, lyrically adroit (witness their hymn to Angela Merkel) and with an attractive sense of their own ridiculousness. OK, so the humour often draws on cliche. If you’re going to joke (again) about the Daily Mail, you need to find something new to say: their a capella list of tabloid bugbears doesn’t. And just because it’s in French doesn’t make their song about racist grandparents novel: racist grandparents are a comedy standby.

The lowest moment comes when a song about Donahoe’s Ukip-supporting dad is matched by one about Gervers’ Green-supporting mum. In this gesture, implying parity between these two supposedly cranky points-of-view, the toothless bipartisanship of British satire is distilled. It’s a shame, because the former is a highlight, as a tongue-tied Donahoe trips over the line between filial respect and disapproval of dad’s bigotry.

That’s symptomatic of a duo who seem more at home not being political but (as with their terrific closer Boom Motherfucker) joking about their political inadequacy. With one excellent exception (a song about gender equality addressed to Donahoe’s niece), they apologise for any position more radical than basic liberal decency, in one instance alternating an expression of what they actually believe with a lyric about willies. Which is jolly enough, and that – more than rocking the vote (or indeed the boat) – is the point: this is political satire of the most consensual variety.

• At Salisbury Playhouse, 29 April to 1 May. Box office: 01722 320 117. Then touring.