ALBERTVILLE — David FitzSimmons knew when he joined a very small group of legislative Republicans who voted for legal gay marriage in Minnesota that he might face political fallout on his conservative home turf. And he did.

FitzSimmons, a first-term House member whose district includes parts of Wright and Sherburne counties, finds himself facing a fellow Republican for the party’s endorsement at a Saturday district convention. His opponent, Eric Lucero, is blasting FitzSimmons as untrustworthy for breaking from the party’s traditional stand on the definition of marriage.