Democrat Zephyr Teachout is launching a bid for the 19th congressional district in the Hudson Valley, she announced on Monday.

“Throughout my career, I’ve never been afraid to stand up for ordinary citizens whose voices are drowned out by special interests, big corporations, and powerful insiders,” Teachout said in a statement. “I’m running for Congress to give people their voices back so together we can address the real concerns facing our communities.”

Her announcement included the unveiling of a “splash page” website.

Teachout, a Fordham Law School professor who has written extensively on the issue of campaign finance, is best known in state political circles for challenging Gov. Andrew Cuomo in a Democratic primary in 2014.

Teachout during the primary did well in upstate counties, including Ulster, the largest county in the district.

Her candidacy comes after several Democrats, including Ulster County Executive Mike Hein and Sean Eldridge — who ran in 2014 and spent heavily in the process — announced they would not seek the nomination.

During the primary, Teachout was able to mobilize Democrats upset with Cuomo’s first economic policies, including teachers and public workers.

The labor-aligned Working Families Party, which declined to back her bid against Cuomo in 2014, announced earlier this month it would support her congressional bid.

Teachout was previously endorsed by county Democratic chairs in the district. The sprawling district includes Ulster, Sullivan, Columbia, Schoharie, Otsego, Delaware and Greene counties and parts of Montgomery, Dutchess, Rensselaer and Broome counties.

The 19th district has been a battleground district since it was redrawn in 2012 to include most of the Hudson Valley region. Incumbent Republican Chris Gibson is considering a run for governor in 2018 and retiring from Congress at the end of the year.

Teachout’s presence in the race likely will make the 19th district another closely watched campaign. Eldridge, a wealthy businessman and husband of Facebook co-founder Chris Hughes, spent heavily in district against Gibson’s re-election bid despite his loss.

On the Republican side, about a half dozen candidates have filed to run, including former Assembly Minority Leader John Faso and businessman Andrew Heaney.