SPRINGFIELD (AP) -- One year after civil unions came to Illinois, some lawmakers are beginning a push to authorize gay marriages.

The legislation was filed Wednesday by three members of the Illinois House. One is Rep. Greg Harris, who was instrumental in getting civil unions approved last year.

The Chicago Democrat says it's too early to say whether gay marriage will become a major issue in this spring's session.

He hopes the bill triggers a period of education and lobbying to build support. Harris says that could take time but activity in other states shows the issue is gaining momentum.

Concerns about elections this year could mean lawmakers will be hesitant to support the legislation. It's also likely to trigger strong opposition from conservative groups.