Do you know each other? <a href=" http://www.lletycynin.co.uk/buy-sertraline-uk.pdf ">sertraline uk forum </a> In a handful of red and purple states, incumbent Democratic senators could face tough races, although big-name GOP challengers have yet to materialize. Battle-tested Sens. Mary Landrieu, D-La., and Mark Pryor, D-Ark., have defeated GOP challenges before, but Sens. Kay Hagan, D-N.C., and Mark Begich, D-Alaska, will be running for reelection for the first time in states that have proven difficult for Democrats in recent years. Again, no star-studded Republican candidates have emerged to challenge them.