“…What has received less empirical attention, and what might be more consequential both for how parties are portrayed in the media and for citizens' long-term opinion formation, is how the media's coverage of horse race polls influences subsequent political coverage in itself. While some studies have examined this dynamic in the short-term context of electoral campaigns (Patterson, 1993(Patterson, , 2016Sides & Vavreck, 2014;Stolwijk, 2017;Wlezien & Soroka, 2018), they are few, and there are virtually no studies investigating this over longer time periods.…”