Placing an advertisement
While speeches will provide a quick boost to an issue's score, the way to solidify an issue's place in the hearts of voters is by using advertisements. Ads provide a weekly boost to your position on the issue, the voters' position on the issue, and the importance of the issue overall. Ads also increase your voter enthusiasm in the state it's placed in, as well as the surrounding states.
Placing an ad is similar to giving a speech: you must pick your issues and your stance carefully depending on what state you're in. Make sure to check the advertisement effects at the bottom of the ad screen to see who your ad resonates with (or doesn't resonate with!). Ads are expensive and require a monthly upkeep cost, but have more long term effects and reach further than speeches.