Pennsylvania U.S. Senator Bob Casey is offering his thoughts on fellow Democratic Senator Joe Manchin’s decision not to run again. The Pennsylvania elder Senator says the West Virginia lawmaker’s departure will make a tough year even tougher. Manchin, a Democrat, announced Thursday that he will not run for reelection. He said that he would be traveling the country to gauge interest in creating a movement to “mobilize the middle and bring Americans together.” That has fueled talk about him potentially running for president as an independent or under the No Labels party.