NEW YORK (CBSNewYork/AP)New York City Council Speaker Melissa Mark-Viverito, a liberal who is becoming a national voice on issues such as immigration, has endorsed Hillary Rodham Clinton for president.

Mark-Viverito, a Democrat, made the announcement Wednesday in an op-ed for El Nuevo Dia, Puerto Rico’s largest newspaper. The speaker, one of the most prominent U.S. politicians of Puerto Rican descent, is traveling to her native island next week with Gov. Andrew Cuomo and other New York elected officials.

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“Hillary understands that we need to continue to drive our country forward and is fighting for causes I have devoted my career to,” Mark-Viverito wrote in the piece.

Observers have suggested the speaker’s endorsement could help solidify a candidate’s support among Latinos, particularly Puerto Ricans who make up large voting blocs in some urban areas.

Mark-Viverito was a relatively obscure city council member just two years ago. She has risen to some prominence in the Democratic Party, particularly on criminal justice reforms and immigration-related issues. She spearheaded the nation’s largest municipal identification program, which allows illegal immigrants — and other groups such as the elderly and the transgendered — to obtain legal identification, a means to access city services.

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She’s made regular appearances on cable TV news as the immigration debate in Washington heats up, and the council has established a fund for unaccompanied immigrant minor’s legal fees. In recent weeks, she’s urged Washington to step in and aid Puerto Rico, which is struggling under the weight of its debt. Clinton also has called for action.

“She’s been a great friend to the island, and she’s really taking on issues that matter to me personally, whether it’s criminal justice reform, talking about comprehensive immigration reform, talking about uplifting families, uplifting pay scale for working individuals here in the country,” Mark-Viverito told reporters, including WCBS 880’s Rich Lamb, on Wednesday. “So she really has a plan. And I’m really proud to endorse her. And it’s time to get a woman in the White House.”

Clinton, a former Secretary of State and New York senator who lives in Chappaqua, is considered the front-runner for the Democratic nomination but has been dogged by questions about her use of a private email account while working in Washington. She’s been locked in a tighter-than-expected race against Sen. Bernie Sanders of Vermont, and Vice President Joe Biden is reportedly weighing a possible run.

Mark-Viverito’s endorsement also will renew focus on Mayor Bill de Blasio, a close Mark-Viverito ally who has yet to endorse a candidate in the race.

De Blasio, who is trying to position himself as one of the party’s leading liberals, was widely expected to immediately endorse Clinton, who employed him as campaign manager for her 2000 Senate bid. De Blasio also worked in her husband’s administration. But the mayor has steadfastly refused to offer his blessing, contending he needs to hear more from other candidates, a move that has been criticized by some Clinton supporters.

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