WASHINGTON – U.S. Rep. John Katko raised more than $521,000 in the second quarter of the year, stocking up on campaign cash as he seeks a fourth term in the 2020 election.

Katko, R-Camillus, ended the quarter with $648,455 cash on hand in his campaign account, according to a disclosure report his campaign plans to file by a Monday deadline with the Federal Election Commission.

Katko’s campaign said his quarterly fundraising total was his best in a non-election year, topping his previous record of $363,000.

Three Democrats have launched bids to challenge Katko in what is expected to be one of the nation’s most competitive House elections in 2020.

Only one, Navy veteran Roger Misso of Syracuse, has shared his fundraising numbers in advance of the Federal Election Commission’s reporting deadline.

Misso, who launched his campaign for the Democratic nomination at the beginning of April, said he will report raising more than $167,000 in the quarter.

Misso said he raised most of his money from individual small-dollar donors. It was not possible to verify the numbers because his campaign has not yet submitted an itemized report with the FEC.

The other Democratic candidates, Dana Balter and Francis Conole, both of Syracuse, declined to share their fundraising numbers ahead of the FEC filing deadline.

Balter launched her campaign in April, making a second bid to unseat Katko after losing by about 5 percentage points in the 2018 election. Balter had $17,347 remaining in her campaign bank account at the end of March, according to FEC records.

Conole, an Iraq war veteran who worked at the Pentagon as a senior intelligence officer, launched his campaign in April. Conole said he raised $100,000 in the first four days of his campaign.

All three Democrats have pledged they won’t accept money from corporate political action committees for their campaigns, citing the corrosive influence of money in politics.

Katko has declined to make a similar pledge. More than half of Katko’s total campaign receipts ($145,000) in the first quarter came from political action committees.

The National Republican Congressional Committee, the campaign arm of House Republicans, has identified Katko as one of its 10 most vulnerable incumbents heading into the 2020 election.

In April, the NRCC selected Katko as an initial member of its “Patriot Program” that provides resources to help House Republicans in their reelection campaigns. Katko was appointed to serve as chairman of the program.

The 24th Congressional District covers all of Onondaga, Cayuga and Wayne counties, and the western half of Oswego County, including the cities of Oswego and Fulton.

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