US Senator Edward J. Markey, who faces voters in November, raised more than a half-million dollars in the first three months of 2014, according to an aide.

Markey spokeswoman Giselle Barry said Markey raised $588,000, spent $326,000 and had $1.67 million in the bank on March 31.

The senator won a special election in 2013 to finish the term of John F. Kerry, who resigned to become secretary of state. Markey beat Republican Gabriel Gomez by 10 percentage points in that contest. Political analysts say the Malden Democrat is favored to win his first full term this November.

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Brian Herr, a Hopkinton Republican, is challenging Markey. On Wednesday, he did not immediately respond to a voicemail message seeking his fund-raising numbers.

Meanwhile, US Senator Elizabeth Warren raised $238,000, spent $259,000, and ended March with $840,000 in the bank, according to her first-quarter filing, which was provided by her campaign. A campaign aide said Warren’s spending over January, February and March included a $100,000 donation to the Democratic Senatorial Campaign Committee, the arm of the party devoted to maintaining Democratic control of the US Senate.

Warren, who unseated Republican Scott Brown in 2012, does not face voters again until 2018.

First-quarter filings were due to the Federal Election Comission by Tuesday. But US Senate fund-raising documents sometimes do not appear online for a few days after they have been filed.