Um. If you read the article, the letter says,
As pro-life women leaders from Iowa and across the nation, we urge Republican caucus-goers and voters to support anyone but Donald Trump.
In the caucus, Trump isn’t running against Hilary. He’s only running against other Republicans. They are saying that Trump isn’t reliable on the issue of abortion, and:
there is, thankfully, an abundance of alternative candidates with proven records of pro-life leadership whom pro-life voters can support. We have come to this conclusion after having listened patiently to numerous debates and news reports, but most importantly to Donald Trump’s own words.
The next president will be responsible for as many as four nominations to the Supreme Court. Mr. Trump has given us only one indication about the type of judges he would appoint …]. Mr. Trump has said his sister, Judge Maryanne Trump Barry, who struck down the Partial Birth Abortion Ban in New Jersey, would be a “phenomenal” choice for the court.
It’s a reasonable letter. We currently have some input into who will be the “last Republican standing,” and they are urging us to use this opportunity wisely, to ensure that the person running against the Democrat candidate is pro-life. Let’s leave the strawman arguments alone. The writers of the letter are more vulnerable when they start talking about Trump’s treatment of women, where the argument seems weak to me.