Marie Newman, who narrowly lost a primary last year to Rep. Daniel Lipinski Daniel William LipinskiFive things we learned from this year's primaries Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Bottom line MORE (D-Ill.), announced Tuesday that she would mount a second campaign against the sitting congressman.

"I’ve got some big news. This morning, I’m making it official: I’m running for Congress again to take on Dan Lipinski," she wrote in a string of tweets.

"#IL03 needs a representative who won’t sell out working families by siding with corporate special interests. Dan Lipinski voted against Obamacare. He opposes paid sick leave. He won’t even support efforts to strengthen Social Security," Newman continued. "We deserve a representative who will vote like a real Democrat in Congress—not someone who routinely sides with Trump and conservative interest groups over his own constituents."

I’ve got some big news.



This morning, I’m making it official: I’m running for Congress again to take on Dan Lipinski.



Let me tell you why:



(1/6) — Marie Newman (@Marie4Congress) April 16, 2019

We deserve a representative who will vote like a real Democrat in Congress—not someone who routinely sides with Trump and conservative interest groups over his own constituents.



(3/6) — Marie Newman (@Marie4Congress) April 16, 2019

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Lipinski, who is one of the few anti-abortion Democrats in the House, is considered one of the Democratic Party's most conservative members.

In 2018, he narrowly defeated Newman in the Chicago-area district's primary election, 51 percent to 48.9 percent.

Newman's announcement comes just weeks after the Democrats' House campaign arm, the Democratic Congressional Campaign Committee (DCCC), announced that it would not do business with political messaging firms that support primary challengers running against sitting House Democrats.

The policy has caused backlash from several House members, including Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezWells Fargo CEO issues apology after saying there was a 'limited pool of Black talent' Brand responds to Trump claim protesters throw tuna cans at police: 'Eat em, don't throw em' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context MORE (D-N.Y.), who urged her followers to "pause" donations to the DCCC until the policy was rescinded.