Among them: Ted Cruz vs. Colin Allred in Texas, Debbie Mucarsel-Powell vs. Rick Scott in Florida
                                
                                
                                    (Newser) -
                                    Democrats currently claim the slimmest majority in the US Senate, 51-49, but they're playing defense heading into Election Day, almost certainly losing Joe Manchin's seat in West Virginia to a Republican and defending seven seats in conservative or swing states, reports  NPR . There are 34 seats in total...