ABC News’ Yunji de Nies Reports: Tomorrow thousands are expected to rally along Constitution Avenue, stopping at the Hill and the Supreme Court during the 37th annual March for Life, held each year on the anniversary of Roe v. Wade. This year’s march has a digital twist: those who can’t make it to Washington can still join in – virtually. There, you can create an avatar and march with the likes of Sarah Palin, Michael Steel and Jon Boehner. – see their avatars here. The March For Life organizers will hold a rally outside of the White House tonight in Lafayette Park. No word on how many are expected to attend, though the group says they are permitted for 3,000. The group is hoping to catch the attention of President Barack Obama, who supports reproductive rights. President George W. Bush was out of town every year the march took place and never attended the rally in person, but did call the marchers to voice his support. Presidents Ronald Regan and George H. W. Bush also addressed the marchers by telephone. President Reagan use his radio address in 1983 to affirm his opposition to abortion. ABC’s Karen Travers contributed to this report.