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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 BoehnerSudan sanctions spur intense lobbying OPINION | GOP's 7-year ObamaCare blood oath ends in failure A simple fix to encourage bipartisanship in the House MORE (R-Ohio) is expected to address the crowd by video. Other speakers include former Sen. Rick Santorum (R-Pa.) and Sen. Rand PaulRand PaulOvernight Healthcare: CBO predicts 22M would lose coverage under Senate ObamaCare replacement Fox News personality: GOP healthcare plan says ‘ideology is less important than victory' Rand Paul opens door to backing healthcare bill on key hurdle 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.