Des Moines Register did a poll to see how many Iowans support a constitutional amendment banning gay and lesbian couples like my own family from legally marrying and found that most Iowans oppose the Iowa Supreme Court decision that paved the way for marriage equality. But they also found that a pretty strong majority oppose amending the state's constitution to involuntarily annul our marriages.
When asked whether or not those polled favored or opposed an initiative to ban same-sex marriage, 56% opposed that initiative while only 38% favored it. 6% were not sure after nearly three years of marriage equality in this state.
When asked whether or not those polled favored or opposed the "recent" (i.e., three year old) ruling by the Iowa Supreme Court that allowed gay and lesbian couples to legally marry in Iowa, 22% strongly favored and 8% favored the decision while 29% strongly opposed it and 7% opposed it. Meanwhile, 33% don't give a toss and 1% aren't sure about the whole thing.
Other stats from the article indicate at 34% of those under 35 support a constitutional ban while 43% of those who are 55+ support a constitutional ban on gay and lesbian families. Additionally 64% of Republicans favor a constitutional ban while 35% of independents and 15% of Democrats favor a constitutional ban on gay and lesbian families.