“Republicans working to keep the Senate are increasingly anxious about holding onto a seat in Mississippi — a GOP stronghold in the deep South — and are investing money in the final weeks to shore up incumbent Sen. Cindy Hyde-Smith,” CNN reports.“Senate Leadership Fund, the leading GOP super PAC focused on Senate races, made an initial reservation of about $160,000 in Mississippi on Thursday, according to AdImpact data, with more cash expected.”“That move comes as Senate Democrats’ announced they’ll spend roughly $1 million on ads for the race — but it’s something that GOP officials had been considering even before the Democratic buy.”