WASHINGTON (CNS) – Amid the usual Knights of Columbus "Defend Life" signs and the throngs of school and parish groups at the 35th annual March for Life Jan. 22, Mark Hall's mobile ultrasound clinics parked on Sixth Street were an unusual new addition.

Hall and three other people drove up from Orlando, Fla., with a specially outfitted RV and a trailer that they more typically park outside abortion clinics, offering women a last chance to take a look through ultrasound at the fetal life they intend to end.

With a location in Washington right behind the stage for the rally that preceded the march, Hall and the "Messengers of Hope," as they call themselves, were attracting a lot of attention from some of the tens of thousands of people from around the country who gathered on the National Mall before marching up Capitol Hill to the Supreme Court.

On the stage, March for Life organizer Nellie Gray introduced a long program of politicians, clergy and other anti-abortion activists who helped warm up a crowd shivering in freezing temperatures and light drizzle.

Among the speakers on the stage, Rep. Christopher Smith, R-N.J., headed off a long string of politicians to take to the microphone to make sure participants saw the fight against abortion in political terms. He warned that "America's liberal elites" were "empathy-deficient" when it comes to the unborn, turning around a phrase about conservatives made by Sen. Barack Obama, D-Ill., in remarks on the presidential campaign trail a few days earlier.

A brief roar of agreement greeted a warning by Sen. David Vitter, R-La., that electing Sen. Hillary Clinton, D-N.Y., or Obama as president would mean nominees for federal judgeships would be less pro-life than those nominated under President George W. Bush, so "we need to elect a pro-life president."

Rep. Ron Paul, R-Texas, himself a candidate for president, downplayed those ambitions to emphasize his experience as an obstetrician, helping bring 4,000 babies into the world. Dozens of "Ron Paul for President" banners held high above the crowd made a point of his political ambitions for him.

In his remarks recorded at a White House breakfast earlier that morning and replayed at the rally, Bush lauded those who work for "a culture of life where a woman with an unplanned pregnancy knows there are caring people who will support her; where a pregnant teen can carry her child and complete her education; where the dignity of both the mother and child is honored and cherished."

March organizer Gray said the turnout for the annual event underscores the recognition that "it's not going to work trying to change this from the top down. It's not working that way. We're going to unite the grass roots."

Knights of Columbus Supreme Knight Carl Anderson said the Knights, who help organize anti-abortion events around the country, do so because "abortion hurts everyone," from the unborn child and the parents to doctors and nurses who are compromised by their participation.

"It undermines respect for judges," he said. "It implicates the taxpayer who pays for it. It coarsens the society that tolerates it."

As in most other years, march participants came from far and near. Busloads of people from Ohio, Pennsylvania, Virginia, Maryland and New York were joined by others who flew in from across the country.