"participating candidates" is correct and usable in written English.
It can be used to refer to people who are involved in or take part in something, such as a competition or an election. For example: "All participating candidates in the election will be given the opportunity to give a speech."
The Arizona law triggered extra, taxpayer-funded matching funds for participating candidates when non-participating candidates -- or even independent groups -- increased their private spending.
Participating candidates abide by contribution and spending limits.
Provide extra subsidies for participating candidates who find themselves running against a rival tapping private donations to far outspend the public financing guidelines.
That program -- with its four-to-one match for qualifying funds raised by participating candidates -- is the crown jewel of New York City's political life.
Under the city's program of campaign finance regulation, participating candidates agree to spending and contribution limits in exchange for getting matching funds from the city.
Imagine a new, genuinely nonpartisan debate sponsor -- a Citizens Debate Commission -- operating with full transparency and resisting the antidemocratic demands of participating candidates.
Mrs. Bachmann's Twitter handle, @teambachmann, was mentioned more than that of any other participating candidate.
If an opposing candidate is not participating in the system and spends more than the lump-sum grant, the participating candidate qualifies for additional matching funds.
It roughly triples subsidies for a participating candidate to $150 million in the primaries, and increases them by a third, to $100 million, in the general election.
In contrast to that format, MySpace and MTV plan to feature live, hour-long sessions with each participating candidate.
Like in New York City, what makes this system effective is the trigger funds provided by Arizona when a participating candidate's opponent spends beyond a certain allowed amount.
