Nicky Morgan has said that she would vote in favour of gay marriage if she was given the chance again.
The Education secretary and equalities minister was one of 175 MPs who voted against the same-sex marriage bill last year.
She was not equalities minister at the time.
Speaking on BBC Radio 4, she said that she had voted against gay marriage because letters she had received from her constituents in Loughborough were 10 to 1 against same-sex marriage.
"I had a lot of constituents who asked me to vote in a particular way and I listened to them and it was an issue of conscience too, but I have certainly learned an awful lot doing this job," she said.
She said that she would now probably vote in favour of gay marriage, but added, "But at the end of the day, as a member of parliament, I'm also here to represent my constituents. I wish that people had come forward earlier to say: 'Actually, we'd like you to support it.'
"I suppose for some people it was obvious but actually I think it was something that we needed to discuss and to debate."