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Last year, about 400,000 people attended the event, and organizers said they expect more this year. This year’s march coincides with the 40th anniversary of the Supreme Court’s decision on Roe v. Wade, the landmark case that affirmed a legal right to have an abortion.

House Speaker John BoehnerJohn Andrew BoehnerFormer top Treasury official to head private equity group GOP strategist Steve Schmidt denounces party, will vote for Democrats Zeal, this time from the center MORE (R-Ohio) is expected to address the crowd by video. Other speakers include former Sen. Rick Santorum (R-Pa.) and Sen. Rand PaulRandal (Rand) Howard PaulGOP senators call for probe of federal grants on climate change Overnight Health Care — Presented by the Association of American Medical Colleges — Key ObamaCare groups in limbo | Opioids sending thousands of kids into foster care | House passes bill allowing Medicaid to pay for opioid treatments US watchdog: 'We failed' to stem Afghan opium production MORE (R-Ky.). Many other Republicans were mingling with the crowd on the National Mall, and even those who are out of town for a workweek back in their districts were tweeting their support for the cause.