In Australia, the Liberal Democratic Party supports cycling through its policy opposing victimless “crimes”. It states about the bicycle helmet law:
Mandatory bicycle helmets – not only are such laws offensive to liberty, but they do not achieve their aim.
You may not be able to vote for the Liberal Democratic Party for the parliament (local Member of Parliament), but you can vote for the Liberal Democratic Party in most states for the senate.
In Western Australia, the Democrats support the decrimilisation of cycling without a polystyrene hat. You can vote for the WA democrats in the senate.