A proposed amendment which would ban gay marriage in Minnesota is up by 7 percentage points, according to a new poll commissioned by ABC affiliate KSTP and conducted by SurveyUSA released on Tuesday.

The survey found 50 percent of Minnesotans favor passage of the amendment, while 43 percent object. Eight percent said they were undecided.

Support outstripped opposition in all regions of the state. The narrowest margin was found in the Twin Cities metro area, where supporters lead opponents by only 2 points (46 to 44%).

Voters under the age of 49 support the amendment 48 to 42 percent, while support is 3 percent higher among “likely voters” over the age of 50 (51 to 44%). (A video report on the poll is embedded on this page. Visit our video library for more videos.)

A Public Policy Polling survey released in June found more Minnesota voters opposed to passage of the amendment than in support of it, with 49 percent opposed and 43 percent in favor.

(Related: Washington gay marriage support holds 18-point lead.)