Initiatives to create a carbon tax and fight big money in politics could be headed for the 2016 ballot in Washington.

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Campaigns for statewide initiatives targeting climate change and big money in politics say they’ve turned in enough signatures to likely qualify for spots on the 2016 ballot.

Backers of Initiative 732, which would impose a new state carbon tax while lowering other taxes, turned in about 100,000 signatures Wednesday to Secretary of State Kim Wyman’s office, bringing their total to more than 350,000.

Meanwhile, supporters turned in more than 325,000 signature for Initiative 735, which seeks to put Washington on record in support of a federal constitutional amendment overturning the Supreme Court’s 2010 Citizens United ruling, which struck down a ban on corporate and union election spending. More signatures are expected to be submitted Thursday.

To qualify, each initiative needs at least 246,372 valid signatures from registered voters. Elections officials recommend turning in at least 325,000 as a cushion to make up for duplicate or invalid signatures.

Elections officials will examine the initiative petitions in coming weeks to verify whether they have enough valid signatures.

Both proposals are initiatives to the Legislature, meaning they’ll first be submitted for consideration by the state House and Senate if certified.

Lawmakers then would have three choices when they convene in January. They could enact the measures into law, allow them to go to the 2016 ballot or send them to the ballot alongside an alternative proposal.