As baby showers go, the party Mary Russell attended to celebrate her niece’s first child was sweet, with about a dozen women offering congratulations over ice cream and cake.

But somewhere between the baby name game and the gifts, what had been light conversation took a sharp turn toward the personal and political — specifically, the battle over access to birth control and other women’s health issues that have sprung to life on the Republican campaign trail in recent weeks.

“We all agreed that this seemed like a throwback to 40 years ago,” said Ms. Russell, 57, a retired teacher from Iowa City who describes herself as an evangelical Christian and “old school” Republican of the moderate mold.

Until the baby shower, just two weeks ago, she had favored Mitt Romney for president.

Not anymore. She said she might vote for President Obama now. “I didn’t realize I had a strong viewpoint on this until these conversations,” Ms. Russell said. As for the Republican presidential candidates, she added: “If they’re going to decide on women’s reproductive issues, I’m not going to vote for any of them. Women’s reproduction is our own business.”